MpaDecFilter: missing "return S_OK;"
update Release.txt
update Little CMS to v2.5 (git d504603)
CONTRIBUTING.md: mention the precommit hook script
Readme.md: switch to Atx-style headers
Readme.md: minor improvements
MpaDecFilter: Fix incorrect safety checks.
Updated Catalan translation.

Refs: #2408.
Fix loading of MicroDVD subtitles after 519ef2671600df1e7db79448754152e628df2f8e.

This commit fixes #2991.
Playlist: Scroll and select the last added item.

This commit fixes #2987.
Playlist: Put MPC-HC on top and give the focus to the playlist after a drag-and drop.

Refs: #2987.