You can now choose how many columns you want your spritesheet to be, allowing you to export atlases.
ISSUE: If the number of columns is larger than the number of rows AND rows * columns are not equal to the number of frames, the result is weird. The exported image has transparent space on its bottom side.
Made AboutDialog.tscn a scene of its own, added logo icons and names for the developer team, contributors and donors. Feel free to change/add things related to you!