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().
bin.includes = plugin.xml,\
META-INF/,\
plugin.properties,\
schema/
src.includes = bin/com/
jars.compile.order = bin/componentAPI.jar
output.bin/componentAPI.jar = bin/
source.bin/componentAPI.jar = src/