NEWS: prepare for 6.6.5
Engine/Task/ObservationZones: BGAStartSectorZone: Change from KeyholeZone to SymmetricSectorZone

A BGAStartSectorZone has no keyhole.
Merge remote-tracking branch '_max/v6.6.x' into v6.6.x

Conflicts:
	NEWS.txt
po: update Polish translation
po: update German translation
allow us to use 64 bit android sdk on mac os x
use mdfind instead of locator on mac os x
show the correct path to the android tool
Android/Nook: import code from TopHat
Android/Nook: use Sleep() instead of system("sleep")
Android/Nook: use File::WriteExisting()

It is ridiculous to use system() to write a string to a file.  Let's
use a simple function we already have.
Android/Main: use Nook::InitUsb()
Android/Main: enable "fast refresh mode" on the Nook Simple Touch
Android/Nook: EnterFastMode() returns bool
Asset: make IsDithered() dynamic on Android

Enable dithering on the Nook Simple Touch.
Asset, Android/Product: enable certain run-time features only on ARM

Reduce overhead on x86 and MIPS.
Screen/ButtonWindow: reverse colors when pressed on E-paper

Same as in ButtonRenderer, which the ButtonWindow does not use yet.
doc: document the Kobo toolchain
Android release v6.7_preview13
LibPNG.cpp: Added missing header for memcpy.