[pitivi] (13 commits) Non-fast-forward update to branch wip-speed-control

[Alexandru Băluț <alexbalut src gnome org>]

The branch 'wip-speed-control' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  85f3200... Add support for time effects
  043e5ea... pipeline: Use GES frame APIs to do frame stepping

Commits added to the branch:

  f49c631... Update Polish translation (*)
  abbc67e... Release 2021.01 (*)
  ec311de... Back to development (*)
  52e7d47... Update Brazilian Portuguese translation (*)
  b48b0ae... docs: Add instructions for inspecting the UI (*)
  42ddc3e... docs: Simplify instructions for installing the Debug symbol (*)
  b216ab8... docs: Fixes to the release instructions (*)
  757953d... docs: Update links (*)
  1a85816... docs: Update GSoC pages (*)
  515fe90... Update Swedish translation (*)
  f48bd92... Add support for time effects
  d0a8bfc... pipeline: Use GES frame APIs to do frame stepping
  393ed4a... data: Remove URL from appdata

(*) This commit already existed in another branch; no separate mail sent