Document how *Flag::Quiet and *Flag::Verbose is used by plugins.

src/MagnumPlugins/AnyImageConverter/AnyImageConverter.h

@@ -134,6 +134,11 @@ empty string.
 
 The output of the @ref convertToFile() function called on the concrete
 implementation is then proxied back.
+
+Besides delegating the flags, the @ref AnyImageConverter itself recognizes
+@ref ImageConverterFlag::Verbose, printing info about the concrete plugin being
+used when the flag is enabled. @ref ImageConverterFlag::Quiet is recognized as
+well and causes all warnings to be suppressed.
 */
 class MAGNUM_ANYIMAGECONVERTER_EXPORT AnyImageConverter: public AbstractImageConverter {
     public:

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.h

@@ -161,6 +161,11 @@ Calls to the @ref image1DCount() / @ref image2DCount() / @ref image3DCount(),
 and @ref image1D() / @ref image2D() / @ref image3D() functions are then proxied
 to the concrete implementation. The @ref close() function closes and discards
 the internally instantiated plugin; @ref isOpened() works as usual.
+
+Besides delegating the flags, the @ref AnyImageImporter itself recognizes
+@ref ImporterFlag::Verbose, printing info about the concrete plugin being used
+when the flag is enabled. @ref ImporterFlag::Quiet is recognized as well and
+causes all warnings to be suppressed.
 */
 class MAGNUM_ANYIMAGEIMPORTER_EXPORT AnyImageImporter: public AbstractImporter {
     public:

src/MagnumPlugins/AnySceneConverter/AnySceneConverter.h

@@ -121,6 +121,11 @@ advertising support for any actual data types. These are included only once
 Calls to the @ref endFile(), @ref add() and related functions are then proxied
 to the concrete implementation. The @ref abort() function aborts and destroys
 the internally instantiated plugin; @ref isConverting() works as usual.
+
+Besides delegating the flags, the @ref AnySceneConverter itself recognizes
+@ref SceneConverterFlag::Verbose, printing info about the concrete plugin being
+used when the flag is enabled. @ref SceneConverterFlag::Quiet is recognized as
+well and causes all warnings to be suppressed.
 */
 class MAGNUM_ANYSCENECONVERTER_EXPORT AnySceneConverter: public AbstractSceneConverter {
     public:

src/MagnumPlugins/AnySceneImporter/AnySceneImporter.h

@@ -157,6 +157,11 @@ plugin; @ref isOpened() works as usual.
 While the @ref meshAttributeName(), @ref meshAttributeForName(),
 @ref sceneFieldName() and @ref sceneFieldForName() APIs can be called without a
 file opened, they return an empty string or an invalid attribute in that case.
+
+Besides delegating the flags, the @ref AnySceneImporter itself recognizes
+@ref ImporterFlag::Verbose, printing info about the concrete plugin being used
+when the flag is enabled. @ref ImporterFlag::Quiet is recognized as well and
+causes all warnings to be suppressed.
 */
 class MAGNUM_ANYSCENEIMPORTER_EXPORT AnySceneImporter: public AbstractImporter {
     public:

src/MagnumPlugins/AnyShaderConverter/AnyConverter.h

@@ -146,6 +146,11 @@ present in the default configuration of the target plugin.
 The output of the @ref validateFile() / @ref validateData(),
 @ref convertFileToFile() / @ref convertFileToData() / @ref convertDataToData()
 function called on the concrete implementation is then proxied back.
+
+Besides delegating the flags, the @ref AnyConverter itself recognizes
+@ref ConverterFlag::Verbose, printing info about the concrete plugin being used
+when the flag is enabled. @ref ConverterFlag::Quiet is recognized as well and
+causes all warnings to be suppressed.
 */
 class MAGNUM_ANYSHADERCONVERTER_EXPORT AnyConverter: public AbstractConverter {
     public:

src/MagnumPlugins/TgaImageConverter/TgaImageConverter.h

@@ -114,6 +114,10 @@ While TGA files can have several extensions, @ref extension() always returns
 @cpp "tga" @ce as that's the most common one. As TGA doesn't have a registered
 MIME type, @ref mimeType() returns @cpp "image/x-tga" @ce.
 
+The converter recognizes @ref ImageConverterFlag::Verbose, printing additional
+info when the flag is enabled. @ref ImageConverterFlag::Quiet is recognized as
+well and causes all conversion warnings to be suppressed.
+
 @section Trade-TgaImageConverter-configuration Plugin-specific configuration
 
 It's possible to tune various output options through @ref configuration(). See

src/MagnumPlugins/TgaImporter/TgaImporter.h

@@ -108,6 +108,10 @@ RLE compression is supported, paletted images are not.
 
 If a TGA 2 footer is recognized in the file, the optional extension and
 developer area blocks at the end of the file are ignored.
+
+The importer recognizes @ref ImporterFlag::Verbose, printing additional info
+when the flag is enabled. @ref ImporterFlag::Quiet is recognized as well and
+causes all import warnings to be suppressed.
 */
 class MAGNUM_TGAIMPORTER_EXPORT TgaImporter: public AbstractImporter {
     public: