Trade: bump AbstractImporter interface version.

With the previous commits, existing plugin implementations built and ran
against the new code, however it introduced several ABI breaks meaning
that existing plugin binaries would crash. This forces them to be
recompiled to match the new version string.

src/Magnum/Trade/AbstractImporter.cpp

@@ -68,7 +68,7 @@ namespace Magnum { namespace Trade {
 std::string AbstractImporter::pluginInterface() {
     return
 /* [interface] */
-"cz.mosra.magnum.Trade.AbstractImporter/0.3.4"
+"cz.mosra.magnum.Trade.AbstractImporter/0.4"
 /* [interface] */
     ;
 }

src/MagnumPlugins/AnyImageImporter/AnyImageImporter.cpp

@@ -280,4 +280,4 @@ Containers::Optional<ImageData3D> AnyImageImporter::doImage3D(const UnsignedInt
 }}
 
 CORRADE_PLUGIN_REGISTER(AnyImageImporter, Magnum::Trade::AnyImageImporter,
-    "cz.mosra.magnum.Trade.AbstractImporter/0.3.4")
+    "cz.mosra.magnum.Trade.AbstractImporter/0.4")

src/MagnumPlugins/AnySceneImporter/AnySceneImporter.cpp

@@ -269,4 +269,4 @@ Containers::Optional<ImageData3D> AnySceneImporter::doImage3D(const UnsignedInt
 }}
 
 CORRADE_PLUGIN_REGISTER(AnySceneImporter, Magnum::Trade::AnySceneImporter,
-    "cz.mosra.magnum.Trade.AbstractImporter/0.3.4")
+    "cz.mosra.magnum.Trade.AbstractImporter/0.4")

src/MagnumPlugins/ObjImporter/ObjImporter.cpp

@@ -487,4 +487,4 @@ Containers::Optional<MeshData> ObjImporter::doMesh(UnsignedInt id, UnsignedInt)
 }}
 
 CORRADE_PLUGIN_REGISTER(ObjImporter, Magnum::Trade::ObjImporter,
-    "cz.mosra.magnum.Trade.AbstractImporter/0.3.4")
+    "cz.mosra.magnum.Trade.AbstractImporter/0.4")

src/MagnumPlugins/TgaImporter/TgaImporter.cpp

@@ -209,4 +209,4 @@ Containers::Optional<ImageData2D> TgaImporter::doImage2D(UnsignedInt, UnsignedIn
 }}
 
 CORRADE_PLUGIN_REGISTER(TgaImporter, Magnum::Trade::TgaImporter,
-    "cz.mosra.magnum.Trade.AbstractImporter/0.3.4")
+    "cz.mosra.magnum.Trade.AbstractImporter/0.4")