Text: forward-declare the nasty STL types.

At the very least. The whole Renderer API needs to go, ugh.

doc/snippets/Text-gl.cpp

@@ -24,6 +24,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include <string>
+#include <tuple>
 #include <Corrade/Containers/StringView.h>
 #include <Corrade/PluginManager/Manager.h>
 

src/Magnum/Text/Renderer.cpp

@@ -38,6 +38,9 @@
 #include "Magnum/Text/Direction.h"
 
 #ifdef MAGNUM_TARGET_GL
+#include <string>
+#include <tuple>
+#include <vector>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/ArrayViewStl.h> /** @todo remove once Renderer is STL-free */
 #include <Corrade/Containers/StringStl.h> /** @todo remove once Renderer is STL-free */

src/Magnum/Text/Renderer.h

@@ -35,9 +35,9 @@
 #include "Magnum/Text/visibility.h"
 
 #ifdef MAGNUM_TARGET_GL
-#include <string>
-#include <tuple>
-#include <vector>
+#include <Corrade/Utility/StlForwardTuple.h>
+#include <Corrade/Utility/StlForwardVector.h>
+#include <Corrade/Utility/StlForwardString.h>
 
 #include "Magnum/DimensionTraits.h"
 #include "Magnum/Math/Range.h"

src/Magnum/Text/Test/RendererGLTest.cpp

@@ -24,6 +24,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include <string>
+#include <tuple>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/StridedArrayView.h>
 #include <Corrade/Containers/StringView.h>

src/Magnum/Text/Test/RendererTest.cpp

@@ -24,6 +24,9 @@
     DEALINGS IN THE SOFTWARE.
 */
 
+#include <string>
+#include <tuple>
+#include <vector>
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/StridedArrayView.h>
 #include <Corrade/Containers/String.h>