Audio: port AbstractImporter away from std::string.

Yes, I plan to merge audio import into Trade::AbstractImporter, but
until that's done, it feels silly to have to pay for the std::string
cruft given that it's present in just two arguments.

src/Magnum/Audio/AbstractImporter.cpp

@@ -31,10 +31,8 @@
 #include <Corrade/Containers/EnumSet.hpp>
 #include <Corrade/Containers/Optional.h>
 #include <Corrade/Containers/String.h>
-#include <Corrade/Containers/StringStl.h> /** @todo remove once AbstractImporter is <string>-free */
 #include <Corrade/PluginManager/Manager.hpp>
 #include <Corrade/Utility/Assert.h>
-#include <Corrade/Utility/DebugStl.h> /** @todo remove once AbstractImporter is <string>-free */
 #include <Corrade/Utility/Path.h>
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT
@@ -97,13 +95,13 @@ void AbstractImporter::doOpenData(Containers::ArrayView<const char>) {
     CORRADE_ASSERT_UNREACHABLE("Audio::AbstractImporter::openData(): feature advertised but not implemented", );
 }
 
-bool AbstractImporter::openFile(const std::string& filename) {
+bool AbstractImporter::openFile(const Containers::StringView filename) {
     close();
     doOpenFile(filename);
     return isOpened();
 }
 
-void AbstractImporter::doOpenFile(const std::string& filename) {
+void AbstractImporter::doOpenFile(const Containers::StringView filename) {
     CORRADE_ASSERT(features() & ImporterFeature::OpenData, "Audio::AbstractImporter::openFile(): not implemented", );
 
     /* Open file */

src/Magnum/Audio/AbstractImporter.h

@@ -31,11 +31,15 @@
  */
 
 #include <Corrade/PluginManager/AbstractManagingPlugin.h>
-#include <Corrade/Utility/StlForwardString.h>
 
 #include "Magnum/Magnum.h"
 #include "Magnum/Audio/BufferFormat.h"
 
+#ifdef MAGNUM_BUILD_DEPRECATED
+/* For APIs that used to take a std::string */
+#include <Corrade/Containers/StringStl.h>
+#endif
+
 namespace Magnum { namespace Audio {
 
 /**
@@ -185,7 +189,7 @@ class MAGNUM_AUDIO_EXPORT AbstractImporter: public PluginManager::AbstractManagi
          * returns @cpp false @ce.
          * @see @ref features(), @ref openData()
          */
-        bool openFile(const std::string& filename);
+        bool openFile(Containers::StringView filename);
 
         /** @brief Close file */
         void close();
@@ -224,7 +228,7 @@ class MAGNUM_AUDIO_EXPORT AbstractImporter: public PluginManager::AbstractManagi
          * implementation opens the file and calls @ref doOpenData() with its
          * contents.
          */
-        virtual void doOpenFile(const std::string& filename);
+        virtual void doOpenFile(Containers::StringView filename);
 
         /** @brief Implementation for @ref close() */
         virtual void doClose() = 0;
@@ -257,7 +261,7 @@ updated interface string.
 */
 /* Silly indentation to make the string appear in pluginInterface() docs */
 #define MAGNUM_AUDIO_ABSTRACTIMPORTER_PLUGIN_INTERFACE /* [interface] */ \
-"cz.mosra.magnum.Audio.AbstractImporter/0.1"
+"cz.mosra.magnum.Audio.AbstractImporter/0.1.1"
 /* [interface] */
 
 }}

src/Magnum/Audio/Test/AbstractImporterTest.cpp

@@ -24,10 +24,8 @@
     DEALINGS IN THE SOFTWARE.
 */
 
-#include <string> /** @todo remove once AbstractImporter is <string>-free */
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/String.h>
-#include <Corrade/Containers/StringStl.h> /** @todo remove once AbstractImporter is <string>-free */
 #include <Corrade/TestSuite/Tester.h>
 #include <Corrade/TestSuite/Compare/Container.h>
 #include <Corrade/TestSuite/Compare/String.h>

src/MagnumPlugins/AnyAudioImporter/AnyImporter.cpp

@@ -52,7 +52,7 @@ bool AnyImporter::doIsOpened() const { return !!_in; }
 
 void AnyImporter::doClose() { _in = nullptr; }
 
-void AnyImporter::doOpenFile(const std::string& filename) {
+void AnyImporter::doOpenFile(const Containers::StringView filename) {
     CORRADE_INTERNAL_ASSERT(manager());
 
     /* We don't detect any double extensions yet, so we can normalize just the

src/MagnumPlugins/AnyAudioImporter/AnyImporter.h

@@ -134,7 +134,7 @@ class MAGNUM_ANYAUDIOIMPORTER_EXPORT AnyImporter: public AbstractImporter {
         MAGNUM_ANYAUDIOIMPORTER_LOCAL ImporterFeatures doFeatures() const override;
         MAGNUM_ANYAUDIOIMPORTER_LOCAL bool doIsOpened() const override;
         MAGNUM_ANYAUDIOIMPORTER_LOCAL void doClose() override;
-        MAGNUM_ANYAUDIOIMPORTER_LOCAL void doOpenFile(const std::string& filename) override;
+        MAGNUM_ANYAUDIOIMPORTER_LOCAL void doOpenFile(const Containers::StringView filename) override;
 
         MAGNUM_ANYAUDIOIMPORTER_LOCAL BufferFormat doFormat() const override;
         MAGNUM_ANYAUDIOIMPORTER_LOCAL UnsignedInt doFrequency() const override;