Bugfixes/better functionality

TextureManager generates unique names for WADs.
WADs are properly removed from the TextureManager.
TextureSelector images are cached.
TextureSelector updates when WAD lists change.
TextureSelector properly updates WAD filter.

Author: treecase

src/gtk/classes/appwin/FaceEditor.hpp

@@ -21,7 +21,6 @@
 
 #include <editor/core/Editor.hpp>
 #include <editor/world/Face.hpp>
-#include <gtk/classes/textureselector/TextureSelector.hpp>
 
 #include <glibmm/binding.h>
 #include <glm/glm.hpp>