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
OMXPlayer: adopt to buffering
OMXPlayer: enable buffering
move NUM_BUFFERS up to BaseRenderer.h
dvdplayer: set dts after successful seek, correct time offsets
dvdplayer: update player state with reference to dts and absolute time
[WIN32] fixed compilation
remove HTTP-API related zeroconf service code
changed: Sleep(0) is defined as sched_yield() in XTimeUtils.cpp (thanks ace20022).