busybox, busybox-initramfs, busybox-hosttools: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
eglibc: add PKG_DEPENDS_TARGET and PKG_DEPENDS_INIT

Signed-off-by: Stephan Raue <stephan@openelec.tv>
diskdev_cmds: add PKG_DEPENDS_TARGET and PKG_DEPENDS_INIT

Signed-off-by: Stephan Raue <stephan@openelec.tv>
open-iscsi: add PKG_DEPENDS_TARGET and PKG_DEPENDS_INIT

Signed-off-by: Stephan Raue <stephan@openelec.tv>
plymouth-lite: add PKG_DEPENDS_TARGET and PKG_DEPENDS_INIT

Signed-off-by: Stephan Raue <stephan@openelec.tv>
scripts/build: dont install development stuff to $SYSROOT_PREFIX by default

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
xbmc: cleanup
systemd: move /etc/systemd/system to /storage/.config/system.d

this fixes systemctl enable/disable/is-enabled/list-units/...
xbmc: prepare to migrate service addons to systemd
vdr-addon: convert to systemd service
vdr-addon: ups. accidently changed loglevel in previous commit
projects/ARCTIC_MC: disable oem support. remove oem/ARCTIC_MC
tvheadend: convert to systemd service
minor cleanup
vdr & tvheadend: forgot to rework WAIT_FOR_FEINIT
xbmc: install systemd-addon-wrapper in correct location

ups ;)
xbmc: service addons/systemd: also handle addon updates
new package: re-add 'unzip'

closes #2820
scripts/*: make development more colorfull :-)

Signed-off-by: Stephan Raue <stephan@openelec.tv>