restore custom rom: preserve selinux attributes
6.55.1
clean up
merge recovery-cm changes to bootloader message:

- merge "Do not wipe block misc on bootloader msg update"
- merge "Allow custom bootloader msg offset in block misc"
- merge "updater: Use custom bootloader msg offset for stage functions"
- merge "updater: Fix multi-stage docs and code"
always build updater binary along recovery
merge: TWRP screen capture function

Many thanks to @Tasssadar for bringing up this:
https://github.com/omnirom/android_bootable_recovery/commit/03fd6c56fe57dcd7cc4a7f7166a00ece42491558

We will drop fb2png use in next commits
drop fb2png binary support
clean up code
enable screen capture through adb shell

this restores fb2png as a built in library
fb2png is now a recovery symlink: this spares +100Kb
fb2png library is only used for adb shell screen capture
touch shortcut uses the new inline code from previous commits
6.56.0
fix potential compile failure when board uses custom graphics.c due to new screen shot function (BOARD_CUSTOM_GRAPHICS)
  - drop to fb2png mode if possible
  - to enable native screen capture, read the comments
6.56.1
new line
fix recovery hang on boot cause vold_connect() failed on some devices
6.56.2
Work with vanir