New Theme Engine [4/6]

Adds aapt for on device compiling of theme assets

Change-Id: I2f9f4b3e27ddf32b339694f9c6d3b75a12b700d9
build: Parse TARGET_COPY_FILES_OVERRIDES late in the setup

Change-Id: Ie3e4a168ff224e3b65e4627c0757e8813a02167f
Dual language

Add en_RU
Support real custom toolchains
Disable block based OTA