Grab.app improvement

[Hierosme]

• [ ] Take a picture of a window
• [ ] Take a picture of a specifed window with a timer
• [x] Take a picture of entire screen
• [x] Take a picture of entire screen with a timer
• [ ] Save a serie of pictures without name file confict
• [ ] Post procession (Zoom, Grop area)
• [x] Copy to clipboard for easy share screenshoot

That require to work with low level XLib like it exemple: https://www.initbrain.fr/code/2015/screenshot-tool/

[louies0623]

In fact, it is better to have this, This way it’s more direct and doesn’t need to be post-produced.