Sequencer - Text Strip - Box Shadow and Outline needs some love

[Draise14]

New text shadow and line feature has been added, but the interface is a mess.

Tasks

• Make hidden content collapse under check boxes with indicators
• Make checkboxes float right
• Document new feature

Details

SHA-1: d66598c

• VSE: Text shadow blur / outline

Text strips in VSE got:

• Configurable shadow angle and offset (previously shadow location relative to
  text was fixed). Currently the shadow position is rounded to integer pixel
  locations; sub-pixel positioning might come later.
• Optional shadow blur amount.
• Optional outline, with color and outline width controls. Outline is
  implemented using jump flooding algorithm.

Images and more detail in pull request.

Pull Request: https://projects.blender.org/blender/blender/pulls/121478