xorg: do not attempt to sttart in installer mode

this fixes installer. currently broken
get rid of vesamenu/livemode

from now on create_livestick.* will create pure installer
sticks. (TODO: cosmetics. rename to create_installstick)

- syslinux/vesamenu is pain with some boards. syslinux 4.x is even more pain
- now we provide images which have the shiny menu/live thingie. make image.
- initramfs/init: FILE=xxx is not needed anymore. images have two ext4 partitions

side note: be very careful when adding features to installer / installer scripts,
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
busybox-initramfs/scripts/init: tweak default nfs mount options

- do soft instead of hard nfs mounts
- decrease timeo,retrans

default timeo (70) * our retrans (10) is a bit too high, causing
long lock-ups on resume from suspend with /storage on nfs (due to a
non-related connman bug)

I have a very basic nfs knowledge, but IMO if 2 retrans with 3 sec
timeout fails, there is a general networking problem and the nfs
share is "broken" anyway (loosy network or so)

ref #2596