CGenlock: Ensure that all member variables are correctly initialized.

The order matters so better initialize from the constructor arguments.

Fixes CID 1226424.
Fix a crash when the maximum number of recent files is set to 0.

We inherited a bug from Microsoft's CRecentFileList which claimed to support a size of 0 but unconditionally access the element 0 of the list.
Fullscreen option page: Automatically resize the list control on init.

Fixes #4653.
Fix: Clicking on the some parts of the volume slider had no effect.

When clicking on the extreme start or end of the slider, the cursor moved but the volume wasn't changed.

This commit fixes #4684.
Updated LAV Filters to 0.62-13-04b5a00 (custom build based on 0.62-8-f581145).

The two custom patches used in d8a4b619d25ff73d36817f39630c2ccea61be357 have been upstreamed.
Update translations from Transifex:

 - Basque
 - British English
 - Chinese (simplified)
 - Croatian
 - Czech
 - French
 - Galician
 - German
 - Greek
 - Japanese
 - Hungarian
 - Malay
 - Polish
 - Portuguese (Brazil)
 - Slovak
 - Spanish
 - Swedish
 - Turkish
 - Ukrainian
 - Vietnamese
Add an Arabic translation.

The composition of the translation team can be found on Transifex: https://www.transifex.com/projects/p/mpc-hc/language/ar/members/.
EVR-CP: Screenshots were corrupted when "Force 10-bit input" was used.

Ref: #4707.