libdvdread: replace perror by fprintf so that it gets picked up in xbmc logs
Fix check common subtitle subdir existence without suffix slash bug.
Merge pull request #2275 from ulion/fix_checking_subtitle_common_subdir_without_slash_end_bug

Fix check common subtitle subdir existence without suffix slash bug.
Use GetProtocol() like other code does.
VideoRenerers: add buffering
add buffering for GLES
WinRenderer: add buffering
DXVA: activate buffering in renderer
linuxrenderer: delete all textures on reconfigure
drop frame counter in application, ask render manager instead
videoplayer: adopt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
vaapi: adopt to buffering in renderer
videoplayer: some rework and documentation
add buffering - some documentation
RenderManager: only flip free buffer if player has added something
move NUM_BUFFERS up to BaseRenderer.h
OMXPlayer: adapt to buffering