PGS Subtitles: Fix random issues (wrong timing, missing subs, etc.).

PGS subtitles rendering had become erratic after ffd5478189f7b27b0ccb7b4fff7307418ce77e98.

Refs: #3691.
Changelog: Add the ticket number corresponding to the "Language" menu removal.

I had forgotten we had a ticket for that.

Fixes #4144.
VSFilter: Use the same subtitle names as the ISR for external subtitles.

Use the video filename to be able to extract more information from the subtitle filenames.
CFile: Use the proper enum in Seek calls.
CTextFile: Make Seek more resilient by avoiding calling GetPosition/GetLength when possible.

This prevents ANSI subtitles files with Unix line endings to crash MPC-HC because of Microsoft's standard library getting confused.

This commit fixes #4307.
Cosmetics: Avoid shadowing variables by using better names.

Additionally use AppendFormat when possible.
Add a "Copy to clipboard" feature to the "Play > Filters" menu.

The list of filters is quite useful for debugging purpose.
Replace CFileVersionInfo class by a namespace.

That class had no member variables and only static methods.

Also add some methods to format version string.
About dialog: Add the video devices to the clipboard output.
Auto-change fullscreen monitor mode: Make the settings handling sane.

The settings weren't even initialized on first run. Also simplify a lot the GUI code used to modify those settings.

This commit fixes some cases where the auto-change fullscreen mode monitor settings got corrupted or missing.

Fixes #4298.
Updated LAV Filters to 0.61.2-19-f9cc8f9 (custom build based on 0.61.2-14-85431f4)

Important changes:
 - LAV Splitter: No subtitles were displayed when using the special "Forced subtitles" track created for PGS subtitles (fixes #4326)
 - Updated ffmpeg library
Reload the Debug Shaders dialog when changing the UI language.
Debug shaders dialog: Ensure the state is saved when exiting MPC-HC.
Update translations from Transifex:

 - Armenian
 - Basque
 - Belarusian
 - Bengali
 - British English
 - Catalan
 - Chinese (simplified and traditional)
 - Croatian
 - Czech
 - Dutch
 - French
 - Galician
 - German
 - Greek
 - Hebrew
 - Hungarian
 - Italian
 - Japanese
 - Korean
 - Malay
 - Polish
 - Portuguese (Brazil)
 - Romanian
 - Russian
 - Slovak
 - Slovenian
 - Spanish
 - Swedish
 - Tatar
 - Turkish
 - Ukrainian
 - Vietnamese