Update to libbootimg 0.2.0

Change-Id: I451bc6dc68a5bd23fa39dbe1ad5c2024ab064b06
Disable alpha blending for fully opaque rectangles

* This makes the rendering several times faster, because the giant
  rectangle used as background no longer uses expensive blending
  calculations, and there are also many other big rectangles which
  don't need it (fileselector, ...).

* Results on hammerhead:
  - WITHOUT the patch - scrolling in fileselector on install page:

      I:render 67 ms, flip 6 ms, total 73 ms
      I:render 82 ms, flip 6 ms, total 88 ms
      I:render 81 ms, flip 6 ms, total 87 ms
      I:render 80 ms, flip 5 ms, total 85 ms

  - WITH the patch - scrolling in fileselector on install page:

      I:render 32 ms, flip 6 ms, total 38 ms
      I:render 16 ms, flip 6 ms, total 22 ms
      I:render 16 ms, flip 7 ms, total 23 ms
      I:render 18 ms, flip 3 ms, total 21 ms
      I:render 18 ms, flip 2 ms, total 20 ms

* On flo, the results are even more noticable - 160ms -> 40ms

Signed-off-by: Vojtech Bocek <vbocek@gmail.com>

Change-Id: I5685763ba21745d7cd93133adf5f0bcb4c9a581f

Conflicts:
	minuitwrp/graphics.c
Disable alpha blending for non-transparent bitmaps

* The difference isn't as big as there are not many big non-transparent
  bitmaps in TWRP, on install screen on flo it is about 5-10ms better.
  Only place where the difference is noticable is keyboard, which is
  pretty big non-transparent bitmap, where it speeds up the render
  by ~40ms on flo.

Signed-off-by: Vojtech Bocek <vbocek@gmail.com>

Change-Id: I4c51ef957ae2a1829ada4eb566e9964f708efcf0