[release] bump version to 12.3

[osx/mavericks] fix rippled rendering with intel gpu

[osx/mavericks] - on mavericks don't use pbo rendering with intel gpus as it might result in distorted rendering (ripple)

- fix crashing with libnfs 1.6 by bumping to 1.6.1 (which is 1.6.0 + a compile fix - 32bit time_t define was missing in the release target of vs project for libnfs)

fix crash loading JPEGs where m_cinfo.scale_num was set to 9 due to not finding a suitably sized scale factor. Thanks to tscheck

[pvr] bump add-ons

[rbp/omxplayer] Add missing omxplayer changes to previous commits

Revert "fixed bug with arial.ttf"

This reverts commit a5b3131d.

[WIN32] fixed: make frodo branch jenkins ready

[osx/mavericks] - fixups for mavericks 10.9

[osx/mavericks] - hide the menubar not only when on mainscreen - mavericks has menubars on all screens - always hide them

[osx/mavericks] - ugly hacked fix for the mouse bug (mouse wasn't able to move over the full screen) - intermediated isolated hacked solution until new windowing is ready

code ended up selecting the default album scraper for artists

With invalid begin/end times, the for loop in GUIEPGContainer.cpp L#825 (https://github.com/xbmc/xbmc/blob/5f33d290e/xbmc/epg/GUIEPGGridContainer.cpp#L825) loops endlessly, freezing XBMC when the user views the "EPG: Timeline" window. Solve this by adding check for invalid end times.

This mainly applies to several MP4 files where we currently can't reliably detect in which chapter we are when
we perform chapter seeking (probably an ffmpeg bug?). To workaround this make sure current chapter != 0 and
fallback to large stepping where appropriate.