feat: scrolling capture and editor

[jhnmks]

Hello,

I think It would be a nice addition to the app if you implemented:

-a scrolling capture feature:
By selecting a specific area of the screen and then it would scroll down or up taking one single long screenshot of the hole page/window.

-an editor window to edit the screenshots after been taken:
Capable of annotation - shapes - blur - crop - etc..

Something like Shotrr App has implemented.

[castdrian]

Feel free to PR

[rowansc1]

+1