To-do to support Zoom Workplace

[rkdarst]

This is a new frontend for zoom that changes some stuff. This affects our OBS scenes.

• Cropping of the top of the screenshare window (Zoom Workplace gives extra padding, which makes it harder to be pixel-perfect).
  • adjust the size when the screenshare window is being resized
  • screenshare window:
    • 63px on top (a screenshot looks like 65 but it's actually 63), 2px on bottom, sides: 2px
  • crop transform in capturing the window
    • same as the above
• Cropping of the gallery window
  • When there is a screenshare, the gallery view now also show the desktop, which affects instructor gallery capture. This isn't good and needs some solution.
• The gallery background removal relied on it being a single background color. That color is now #000000, pure black, which is also often present in the picture. Thus, some of the instructor pictures can have areas made transparent. This can possibly be solved by the account admin setting a wallpaper with the old color #1a1a1a.