Background Remover tool

[daemoth]

Background Remover V03
-Added the functionnality to select a sprite images amongst the list loaded, which generate the preview for that frame. Pressing the "Delete key" while a frame is selected will delete it.
-Added functionnality to save as a Gif, you can also set the delay between each frame.
- Fixed a few visual issue.

Edit:
Background Remover V04
- You can preview the animation by clicking the preview animation button.
-You can click the background sprite and press delete to delete it.
- You can now resize the capture screen by drag and dropping the edge of the capture screen.