[Request] Crop overscan for Vita version.

[Snowbro88]

Hi, I promise this will be the last request for a while.

Due to the different resolutions that Commodore Amiga games handle and the developers used to leave black borders on the screen as you can see for example in these screenshots in a PS Vita:

It would be interesting to have an automatic core option that detects those black borders and when zooming in, it suppresses them maintaining the aspect ratio, it is a feature of the PUAE core and other emus that would be great if it could be implemented in UAE4ARM, it has several zoom levels and even an automatic option to remove the black borders.

Thank you very much.

[Vecinagamer]

Hello, very good friends.
It would be interesting to be able to do what our friend @Snowbro88 proposed to us.