busybox-initramfs: init: support update from .tar files

closes #2732
busybox-initramfs: init: cosmetics
libass: update to libass-0.10.2
busybox-initramfs: init: silence possible warnings on update

ref #2732
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