MpaDecFilter->Mixer: fixed FlushBuffers() function
AviSplitter: correct subtype then wFormatTag = WAVE_FORMAT_EXTENSIBLE.
PlayerSeekBar: Simplify chapter lookup.
Should be more efficient since the internal algorithm uses binary search.
Subtitles parser: small optimizations.
Updated German translation.
Updated Spanish translation.
Cosmetic: fix a typo.
Revert "MPCVideoDec: fixed playback h264 after "stop" on Intel HD Graphics (force recreate dxva decoder)."

This reverts commit 6d51fc694ab79ea51e530ba7eeab7ea3a548e9a8.

This caused many issues like green screen when starting playback.
Subtitles downloader: Sort by language and then by filename by default.

Fixes #2144.
Initialize variables in the constructor.
losslessly compress res/tickcross.png
update lcms2 to 570d411
Cppcheck fixes:

* reduce variable scope
* remove unneeded variable assignments
update Authors.txt
MPCVideoDec: fixed playback h264 after "stop" on Intel HD Graphics (second very safe version).
PlayerPlaylistBar.cpp: fix x64 warnings
run astyle
SubtitleDlDlg: fix x64 warnings
Update the Changelog.
SubtitleDlDlg: Double-clicking/Pressing Enter download the selected files.

This commit fixes #2926.