Support getting transcoder bitrates from other servers than the "best" one.

Fixes #930
Work around iOS client strange playMedia call for now.

Multiple problems. Revisit this when iOS is conforming to the spec.

Fixes #928
Fixing ffmpeg compile for VAAPI, VDPAU on internal ffmpeg on OE

If not setting CMAKE_PREFIX_PATH on ffmpeg configure on non standard platforms
hardware acceleration cannot find the right libraries.
Removing conflicting options.

cannot enable/disable in one config.
Merge pull request #933 from ziggimon/frodo-ffmpeg-fix

Fixing ffmpeg compile for VAAPI, VDPAU on internal ffmpeg on OE
Fix back button in VideoOSD

Close the dialog windows if they are open, otherwise stop Media.

Fixes #927
"mute" is not a controllable.

Fixes #921
Installer now checks for Vista or later.

Fixes #919
Implement skipTo for pictures

Fixes #917
Don't show myPlex dialogs when we are not logged into myPlex.
Close Audio/Subtitle pickers when we close the video window.
Hide some pop-ups when playing video.

Fixes #904
Revert "Installer now checks for Vista or later."

This reverts commit e7e92c57fe2f38a5d518f5bad5063c139baff8f7.
Update releasenotes