* Use Image instead of BitMap for selection
Not complete and Pixelorama is currently broken
* Add a SelectionMap class
* Make the changes in Selection.gd
* Remove selection_bitmap
* Replace duplicate() with copy_from()
* Fix selection
Intersection and transforming are not working
* Fix wrong pixel color values
* Fix selection transforming
* Call selection_bitmap_changed() on scale
* Fix clipboard
* Remove bitmap_to_image()
* Rename selection_image to selection_map
* No errors in Magic Wand
* Rename selection_bitmap_changed() to selection_map_changed()
* Format
* Fix selection resizing
* Remove a line from image effects
* Fast selection inverting using shader
* Update SelectionMap.gd
* Format
* Convert SelectionMap back to LA8 after inverting
* Minor refactor in RectSelect.gd
* Fix intersections
* Use shader for ColorSelect and add color similarity option
* Update RotateImage.gd