major refactor to wrap retieval of macros all around ISymbianBuildContext, to avoid need to access internal apis. Added getTargetTypeMacro(String targettype),
List<IDefine> getMetadataMacros(), List<IDefine> getBuildMacros().
source.. = src/
output.. = bin/
bin.includes = META-INF/,\
.,\
data/,\
plugin.xml