syslinux/image: enable debugshell in installer mode
sync unofficial
linux: update to linux-3.12

TODO:
  fix RPi (linux patch)
  fix ATV (xf86-video-nvidia-legacy)
xbmc: update to xbmc-13.alpha-fd297a5
config/addon/addon.xml: bump
addons: bump
libxml2: build with --with-sysroot
bcm2835-bootloader/release: append /usr/sbin:/sbin to $PATH

or image creation may fail at mkfs.vfat.
projects/RPi: update to linux-3.12
Workaround for some Radeon SI cards (Alex Deucher)
Fix 24p and 24.0 playback by calculating the modelines correctly (via https://bugs.freedesktop.org/show_bug.cgi?id=69675)
Calulate Modelines more accurately (via: https://bugs.freedesktop.org/show_bug.cgi?id=69675)
Merge pull request #2738 from fritsch/master

AMD: Modeline calculation and stability fixes
gettext: build without java
Fix missing multichannel SAD in some cases (done by Anssi)
Merge pull request #2740 from fritsch/master

Fix missing multichannel SAD in some cases (done by Anssi)
service.openelec.settings: update to service.openelec.settings-0.3.6