[dxvahd] attempt to fix colour range
Don't keep temp CReadState on CurlFile::Seek

Apparently there are a lot of servers around that limit to two
concurrent connections.  This also eliminates a potential leak of the
temporary CReadState should the early return be taken.
Try CurlFile::Seek without multisession on failure
Minor refactor of CurlFile::Seek
Merge pull request #4546 from t-nelson/curl_no_more_than_two_in_multi

Curl multi-session fixes
fix album rating wasn't saved in the database
Merge pull request #4573 from jmarshallnz/dxva_yuv_range_fix

[dxvahd] attempt to fix colour range
fixed: Downloading subs for rars was broken
Merge pull request #4572 from arnova/rar_subs

fixed: Downloading subs for rars was broken
videoplayer: adapt lateness detection and dropping to buffering
video player: present correct pts to user for a/v sync (after buffering in renderer)
videoplayer: some rework and documentation
renderer: bump buffers to 5
videoplayer: update frametime, it might change due to fps detection
videoplayer: give streams with invalid fps a chance for fps detection
dvdplayer: allow rewinding at end of stream, do a seek after rewind
X11: ditch SDL for video and window events
X11: Add xbmc icon
X11: add SDL joystick until we have a better solution
X11: factor out code handling device reset notification