Update mkvtoolnix to 37.0.0

Summary:
New features and enhancements

• MKVToolNix GUI: the list of often used languages now contains those from Wikipedia's "List of languages by native speakers" by default. Also by default only those languages will be shown in the language drop-down boxes.

Bug fixes

• MKVToolNix GUI: multiplexer: fixed a bug in the "make destination file names unique" logic that caused an existing number-in-parenthesis at the end of the file base name to be removed in certain situations (e.g. when the first added file was named m (3).mkv and both m (3) (1).mkv and m (3) (2).mkv existed already, the GUI was suddenly use m.mkv instead of m (3) (3).mkv).

Signed-off-by: Pierre-Yves <pyu@riseup.net>

Test Plan:

• mkvinfo test.mkv
• open medias in MKVToolNix GUI

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D7033