[rbp/settings] Allow av sync type to be enabled

It works for dvdplayer
xbmc pr 3080
[omxplayer] Don't propagate 3d flags based on supported 3d modes
[graphics] Don't set stereo mode based on resolution

The resolution change should follow stereo mode
[graphics] Allow switching to a more suitable 3D resolution
[3D] Support switching to 3D resolutions

Include matching 3D flags (SBS/TAB) in the score of a resolution to switch to, to enable switching to 3d modes.
Also remove the old code that treated 3D modes differently when assigning a score.
[graphics] Make pixel ratio for 3d modes consistent

Note: Use the stored stereo flags from lists of resolutions.
Use current stereo mode for current resolution.
filesystem: Make support of browsing into archives optional

The ability to browse, scan and play content in archives can cause problems on low powered/low memory devices.
It's quite common to see reports of a large rar file that causes xbmc to crash with an out-of-memory error when browsing or scanning.
It also can be slow as any archive in the directory is opened and extracted.

Add a settings option to enable this feature and default to disabled on Pi
confluence: Remove media-overlay.jpg for when video is backgrounded
[omxplayer] Add acceleration option to choose omxplayer/dvdplayer automatically
AE: Add some logging for suspend/resume
[rbp] Make cachemembuffersize default depend on memory size
[confluence] Use animated gif as a cheaper working spinner
[experimental] Disable quiet-noise generation
[settings] Experiment: Report DESKTOP resolution in video settings
Added some vc_tv_* functions that were missing in DllBCM.
Added private utility function to map a float display aspect, to the respective SDTV_ASPECT_* enum value.
Changed SDTV resolutions to be treated similarly to HDMI resolutions in SetNativeResolution. This means that the SDTV interface is powered up and set to the right mode.
Added methods SuspendVideoOutput() and ResumeVideoOutput() to CRBP class, which can be used to power down the Raspberry PI's video interface, and restore it at a later point.
PowerManager (and its IPowerSyscall instance) now gets called from CApplication::OnKey() and can process and suppress key presses. This is a requirement to implement a virtual sleep state.