Project: moved transparency unit conversions to Common lib
Common: use common transparency conversion for GUIMain
Engine: support for sprite blending modes
Common, Engine: GUI and sprite drawing routines use sprite blending
Debian: Ignore that agslua is not in the source traball, because it's a git submodule.
ags+libraries: add hint about updating chroots.
Replace hardcoded property name length with named macro
Added NativeConstants class for editor to read shared constants from native code
Editor now builds data file from managed code
Added Preferences option to enable legacy compiler (as backup if new DataFileWriter class has errors)
Corrected GetNativeConstant not having a default return value
Common: removed padding buffer from AlignedStream class
Merge pull request #208 from monkey0506/editor_data_files

Editor builds data files from managed instead of native code