Add downloader of proprietary data
Add user to buildtype
Add makefiles of device/aosp and vendor/aosp
Change PRODUCT_BRAND and PRODUCT_MODEL for products
Define PRODUCT_BUILD_PROP_OVERRIDES of Factory Image(Android4.4)
Add the definition of AOSP build
Fixed a problem where the value of PRODUCT_COPY_FILES and PRODUCT_PROPERTY_OVERRIDES and PRODUCT_PACKAGES is overwritten
Changed to not use the device/samsung/manta/audio_effects.conf at full build
Update Android 5.0 (LRX21P)
Change to the build system of jcrom
Add makefiles of jcrom