Updated LAV Filters to 0.62-36-126eb21 (custom build based on 0.62-31-45b14b6).

Important changes:
 - LAV Audio: AAC seeking improvements
 - LAV Splitter: improved GIF support (including animated GIF).
 - Updated ffmpeg library.
Sync Renderer: Fix the computation of the FPS used by the ISR.

We need to use the average FPS not the currently measured FPS.

Not doing that could lead to wrong timings for subtitles using frame-based timings.

Fixes #4857.
Cosmetic: Fix a typo.
QuickTime graph: Ensure all errors are correctly reported.

Ref: #4863.
Update translations from Transifex:

 - Arabic
 - Basque
 - British English
 - Chinese (Simplified)
 - Catalan
 - Croatian
 - Czech
 - Dutch
 - French
 - Galician
 - German
 - Hungarian
 - Italian
 - Japanese
 - Polish
 - Portuguese (Brazil)
 - Slovak
 - Spanish
 - Swedish
 - Thai
 - Ukrainian
 - Vietnamese
Playback option page: Minor UI adjustment.

Ref: #4766.
Formats option page: Reworked UI.

Replace the text buttons by icon buttons and add a new button to clear all associations.

Also replace the "with icons" checkbox text with something clearer now that there is more space.

Fixes #4687.
Subtitles options: Clarify the "Delay interval" setting.

 - Rename it "Delay step".
 - Add a tooltip to explain what it does exactly.

Fixes #4865.
Rasterizer: Reallocate memory only once.
Subtitles: Add z-cord limit removed in 8f3d30412adad6bfa152c6ebf8738965bb79cf28.

Without limit we transform points not relalistic to render.

Add const to some values and remove definition of values used only once.
Rasterizer: Remove sanity checks.

They are imperfect and can cause valid "sane" subtitles to not
show. Instead check for memory allocation failures.
Properly catch a bad allocation exception.

On MFC projects `CMemoryException` is thrown instead of the
STL's `std::bad_alloc` exception.
Use nullptr instead of casting 0 to pointer.
Add support for basic RTMP urls
Use internal filters for gif format.

Microsoft's Generate Still Video filter has problems with animation rate and store every
frame (uncompressed) in memory, which for gifs with longer animation can be a problem.

Fixes #4678, #4856
Merge remote-tracking branch 'upstream/master'