[bluray] Allow retrieval of arbitrary items from a Blu-ray directory.
[ext. subs] Also check for external subtitles for Blu-ray disc image files.
Merge pull request #5204 from ace20022/bd_extsubs

[Fix] Make ext. subtitle loading work for Blu-ray disc image files and Blu-ray directories.
Merge pull request #4153 from alexmaloteaux/configure_libbluray_fix

compil against external libbluray
Merge pull request #5442 from popcornmix/omx_pcm_fix

[omxplayer] Fix bad audio when sample_fmt is not reported on Open
Merge pull request #5395 from jimfcarroll/addon-update-deadlock

[fix] Closes #15423 Addon update deadlock due to race condition deleting CThread
[readme] update master github README

This updates the master github readme to github markdown
aside from formatting added basic links and info.
Merge pull request #5426 from uNiversaI/fix-readme-typos

[readme] update master github readme
Merge pull request #5354 from popcornmix/mmal_acceleration

[mmal] Add MMAL decoder and MMAL renderer for Raspberry Pi
Merge pull request #5404 from ulion/show_picture_cmd
[dvdplayer] Remove omx render features from dvdplayer and handle in mmalrenderer
Merge pull request #5446 from FernetMenta/s24

AE: fix S24NE3
Merge pull request #5437 from veger/posix-fix

Improve portability
fixed: VAAPI compile warnings
fixed: GUIEPGGRidContainer compile warning
fixed: MusicDatabase compile warning
fixed: TextureManager compile warnings
fixed: CDDB compile warning
fix hiding component-specific logging when debug logging is enabled and hidden through advancedsettings.xml (fixes #15409)
[posix] [vfs] Implement PosixFile class for accessing local files on Posix platforms