GL: remove unneded ArrayView.h include from headers.

It was needed in the times before StringView, where the setLabel() APIs
had overloads taking a const char(&)[size] to avoid allocating a
std::string. But that got all removed and cleaned up in
bc884428f8 (two years ago!), yet somehow I
forgot to remove these includes as well.

In some cases the ArrayView was still used inside the header for
delegating from std::initializer_list overloads. Those are now
deinlined to not need the include anymore. The only remaining place that
*needs* an ArrayView include is Buffer.h, where it accepts an
initializer_list<T>. But there it's fine I think, the class is dealing
with memory as well.

src/Magnum/GL/AbstractQuery.h

@@ -30,7 +30,6 @@
  */
 
 #include <utility> /* std::swap() */
-#include <Corrade/Containers/ArrayView.h>
 #include <Corrade/Utility/Assert.h>
 
 #include "Magnum/Tags.h"

src/Magnum/GL/AbstractTexture.cpp

@@ -154,12 +154,15 @@ void AbstractTexture::unbind(const Int firstTextureUnit, const std::size_t count
     Context::current().state().texture.bindMultiImplementation(firstTextureUnit, {nullptr, count});
 }
 
-/** @todoc const std::initializer_list makes Doxygen grumpy */
 void AbstractTexture::bind(const Int firstTextureUnit, Containers::ArrayView<AbstractTexture* const> textures) {
     /* State tracker is updated in the implementations */
     Context::current().state().texture.bindMultiImplementation(firstTextureUnit, {textures.begin(), textures.size()});
 }
 
+void AbstractTexture::bind(const Int firstTextureUnit, const std::initializer_list<AbstractTexture*> textures) {
+    bind(firstTextureUnit, Containers::arrayView(textures));
+}
+
 void AbstractTexture::bindImplementationFallback(const GLint firstTextureUnit, const Containers::ArrayView<AbstractTexture* const> textures) {
     for(std::size_t i = 0; i != textures.size(); ++i)
         textures && textures[i] ? textures[i]->bind(firstTextureUnit + i) : unbind(firstTextureUnit + i);
@@ -284,8 +287,11 @@ void AbstractTexture::unbindImage(const Int imageUnit) {
 }
 
 #ifndef MAGNUM_TARGET_GLES
-/** @todoc const Containers::ArrayView makes Doxygen grumpy */
-void AbstractTexture::bindImages(const Int firstImageUnit, Containers::ArrayView<AbstractTexture* const> textures) {
+void AbstractTexture::unbindImages(const Int firstImageUnit, const std::size_t count) {
+    bindImages(firstImageUnit, {nullptr, count});
+}
+
+void AbstractTexture::bindImages(const Int firstImageUnit, const Containers::ArrayView<AbstractTexture* const> textures) {
     Implementation::TextureState& textureState = Context::current().state().texture;
 
     /* Create array of IDs and also update bindings in state tracker */
@@ -312,6 +318,10 @@ void AbstractTexture::bindImages(const Int firstImageUnit, Containers::ArrayView
     /* Avoid doing the binding if there is nothing different */
     if(different) glBindImageTextures(firstImageUnit, textures.size(), ids);
 }
+
+void AbstractTexture::bindImages(const Int firstImageUnit, const std::initializer_list<AbstractTexture*> textures) {
+    bindImages(firstImageUnit, Containers::arrayView(textures));
+}
 #endif
 
 void AbstractTexture::bindImageInternal(const Int imageUnit, const Int level, const bool layered, const Int layer, const ImageAccess access, const ImageFormat format) {

src/Magnum/GL/AbstractTexture.h

@@ -30,7 +30,6 @@
  */
 
 #include <utility> /* std::swap() */
-#include <Corrade/Containers/ArrayView.h>
 
 #include "Magnum/DimensionTraits.h"
 #include "Magnum/ImageFlags.h"
@@ -252,9 +251,7 @@ class MAGNUM_GL_EXPORT AbstractTexture: public AbstractObject {
         static void bind(Int firstTextureUnit, Containers::ArrayView<AbstractTexture* const> textures);
 
         /** @overload */
-        static void bind(Int firstTextureUnit, std::initializer_list<AbstractTexture*> textures) {
-            AbstractTexture::bind(firstTextureUnit, Containers::arrayView(textures.begin(), textures.size()));
-        }
+        static void bind(Int firstTextureUnit, std::initializer_list<AbstractTexture*> textures);
 
         #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
         /**
@@ -293,9 +290,7 @@ class MAGNUM_GL_EXPORT AbstractTexture: public AbstractObject {
          * @requires_gl44 Extension @gl_extension{ARB,multi_bind}
          * @requires_gl Multi bind is not available in OpenGL ES and WebGL.
          */
-        static void unbindImages(Int firstImageUnit, std::size_t count) {
-            bindImages(firstImageUnit, {nullptr, count});
-        }
+        static void unbindImages(Int firstImageUnit, std::size_t count);
 
         /**
          * @brief Bind textures to given range of texture units
@@ -320,9 +315,7 @@ class MAGNUM_GL_EXPORT AbstractTexture: public AbstractObject {
         static void bindImages(Int firstImageUnit, Containers::ArrayView<AbstractTexture* const> textures);
 
         /** @overload */
-        static void bindImages(Int firstImageUnit, std::initializer_list<AbstractTexture*> textures) {
-            bindImages(firstImageUnit, Containers::arrayView(textures.begin(), textures.size()));
-        }
+        static void bindImages(Int firstImageUnit, std::initializer_list<AbstractTexture*> textures);
         #endif
 
         /** @brief Copying is not allowed */

src/Magnum/GL/Framebuffer.h

@@ -30,8 +30,6 @@
  * @brief Class @ref Magnum::GL::Framebuffer
  */
 
-#include <Corrade/Containers/ArrayView.h>
-
 #include "Magnum/Tags.h"
 #include "Magnum/GL/AbstractFramebuffer.h"
 

src/Magnum/GL/Mesh.h

@@ -29,7 +29,6 @@
  * @brief Class @ref Magnum::GL::Mesh, enum @ref Magnum::GL::MeshPrimitive, @ref Magnum::GL::MeshIndexType, function @ref Magnum::GL::meshPrimitive(), @ref Magnum::GL::meshIndexType()
  */
 
-#include <Corrade/Containers/ArrayView.h>
 #include <Corrade/Utility/ConfigurationValue.h>
 
 #include "Magnum/Tags.h"

src/Magnum/GL/Renderbuffer.h

@@ -30,7 +30,6 @@
  */
 
 #include <utility> /* std::swap() */
-#include <Corrade/Containers/ArrayView.h>
 
 #include "Magnum/Tags.h"
 #include "Magnum/GL/AbstractObject.h"

src/Magnum/GL/TransformFeedback.cpp

@@ -223,6 +223,10 @@ TransformFeedback& TransformFeedback::attachBuffers(const UnsignedInt firstIndex
     return *this;
 }
 
+TransformFeedback& TransformFeedback::attachBuffers(const UnsignedInt firstIndex, const std::initializer_list<Buffer*> buffers) {
+    return attachBuffers(firstIndex, Containers::arrayView(buffers));
+}
+
 void TransformFeedback::attachImplementationFallback(const GLuint firstIndex, Containers::ArrayView<const Containers::Triple<Buffer*, GLintptr, GLsizeiptr>> buffers) {
     bindInternal();
     Buffer::bind(Buffer::Target(GL_TRANSFORM_FEEDBACK_BUFFER), firstIndex, buffers);

src/Magnum/GL/TransformFeedback.h

@@ -33,7 +33,6 @@
 #endif
 
 #include <utility>
-#include <Corrade/Containers/ArrayView.h>
 
 #include "Magnum/Tags.h"
 #include "Magnum/GL/AbstractObject.h"
@@ -375,9 +374,7 @@ class MAGNUM_GL_EXPORT TransformFeedback: public AbstractObject {
         TransformFeedback& attachBuffers(UnsignedInt firstIndex, Containers::ArrayView<Buffer* const> buffers);
 
         /** @overload */
-        TransformFeedback& attachBuffers(UnsignedInt firstIndex, std::initializer_list<Buffer*> buffers) {
-            return attachBuffers(firstIndex, Containers::arrayView(buffers));
-        }
+        TransformFeedback& attachBuffers(UnsignedInt firstIndex, std::initializer_list<Buffer*> buffers);
 
         /**
          * @brief Begin transform feedback