Ignore media content with .nomedia in parent

Currently there is no quick way to ignore certain media files, the
android ecosystem has a '.nomedia' file to exclude directories from
being scanned. Add the same functionality to XBMC.
[dvdplayer] Remove omx render features from dvdplayer and handle in mmalrenderer
[vfs] PosixFile: better handle errors on Read/Write
[vfs] Win32File: better handle errors on Read/Write
dvdplayer: another ssa subtitle fix
[python] Clearly state that Player.pause() also resumes.
[GLES] Fix build break on i.MX 6 based systems
fixed: VAAPI compile warnings due to unused variables
fixed: LinuxRendererGL compile warning due to unused variable
fixed: Util.cpp compile warnings due to unused variables
Merge pull request #5480 from FernetMenta/subs

dvdplayer: another ssa subtitle fix
Merge pull request #5469 from Phaeodaria/tegra-omx-pr
Merge pull request #5471 from mkortstiege/compile_warnings

compile warnings due to unused variables
Merge pull request #5468 from anaconda/pydocs-pause-resumes

[python] Clearly state that Player.pause() also resumes.
Merge pull request #5441 from popcornmix/remove_player_features

[dvdplayer] Remove omx render features from dvdplayer and handle in mmalrenderer
Merge pull request #5465 from Karlson2k/vfs_better_hadle_io_errors

Better handle Read/Write errors in PosixFile and Win32File
Merge pull request #3748 from denizt/nomedia