Modify the About label

Merge latest pot

	for <style> <class name="foo"/> </style>, Fixes bgo 658035.

Added GladeWidget:template-class property with setter and getter functions.
Removed if (!glade_xml_node_verify (node, GLADE_XML_TAG_WIDGET)) check from every GWA read_widget()

Fixed Bug #679589 "Use Action Appearance not supported for GTK 2.12 but added to widgets in Glade 3.8.2"
Made sure use-action-appearance is not saved if there is no action defined

Added glade_displayable_value_is_disabled/set_disabled() functions to disable GdkModifierType reserved values

Added build/mingw-w64 directory with script tp cross compile and create windows installer using nsis

Removed old undefined symbols to fix build error on windows
	glade_app_get_plugins_dir()
	glade_catalog_supports_libglade()
	glade_catalog_supports_gtkbuilder()
	glade_signal_editor_construct_signals_list()

Fixes bug #675977 "Don't hard-code library search paths"

gtk_builder_add_from_resource()