Fix various GCC warnings

- fix overload hiding
- handle missing enumeration values in switch
- remove extraenous semicolons
- always have defaults in color converter switch
- fix root cause of stringop warning

source/Irrlicht/CSkinnedMesh.cpp

@@ -82,7 +82,7 @@ namespace
 	{
 		return a.rotation == b.rotation;
 	}
-};
+}
 
 namespace irr
 {