direction sprite widget update, var_file handling for varfile sprite file
	modified:   tools/sprite-editor/direction_sprite.py
	modified:   tools/sprite-editor/direction_sprite_widget.py
	modified:   tools/sprite-editor/gui/direction_sprite_widget.py
	modified:   tools/sprite-editor/gui/direction_sprite_widget.ui
	modified:   tools/sprite-editor/main_window.py
	modified:   tools/sprite-editor/sprite.py
	modified:   tools/sprite-editor/sprite_widget.py
	new file:   tools/sprite-editor/var_file.py