MapItemListRenderer: remove defaulted PolygonRotateShift() scale parameter
{Airspace,MapItem}ListRenderer: re-add Layout::FastScale() call

Got lost in commit 02d5b1d5
Layout/Scale: use "int" instead of "PixelScalar"
Makefile: use Android NDK r10c
Makefile: set ANDROID_NDK_PLATFORM = ANDROID_SDK_PLATFORM

The latest NDK supports android-19 and the comment is no longer
applicable.
Terrain/RasterWeather: use nullptr instead of NULL
Terrain/RasterWeather: apply coding style
Terrain/RasterWeather: remove unused method ValueToText()
Terrain/RasterWeather: add API documentation