Add --angle

Add an option to rotate the video content by a custom angle.

Fixes #4135 <https://github.com/Genymobile/scrcpy/issues/4135>
Fixes #4345 <https://github.com/Genymobile/scrcpy/issues/4345>
Refs #4658 <https://github.com/Genymobile/scrcpy/pull/4658>
PR #5455 <https://github.com/Genymobile/scrcpy/pull/5455>