GTK: Added GTK2 support for GResource embedded images. Removed the App ID from the resource namespace. I assume the namespace is per process and this should be sufficient, but can revisit adding the application name or application ID to the resource namespace later.

[Desktop Entry]
Name=Dynamic Windows Test
Exec=@prefix@/bin/dwtest 
Terminal=false
MultipleArgs=false
Type=Application
Categories=Application;Development;X-Red-Hat-Base;