supercam: add missing files
overlay: fix boot & recovery
cm.mk: remove CM_BUILDTYPE
recovery: fix ums, boot mode
tools: update repackszb.sh
img2dir.sh: a tool to unpack system.img, preload.img, cpimage.img
tools: reorgs simg2img(ics) make_ext4fs_ics to ics_ext4_utils

Signed-off-by: scue <linkscue@gmail.com>