sprite saving
	modified:   tools/sprite-editor/frame_widget.py
	modified:   tools/sprite-editor/gui/frame_widget.py
	modified:   tools/sprite-editor/gui/frame_widget.ui
	modified:   tools/sprite-editor/gui/main_window.py
	modified:   tools/sprite-editor/gui/main_window.ui
	modified:   tools/sprite-editor/gui/sprite_widget.py
	modified:   tools/sprite-editor/gui/sprite_widget.ui
	modified:   tools/sprite-editor/main_window.py
	modified:   tools/sprite-editor/sprite.py
	modified:   tools/sprite-editor/sprite_widget.py