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/,\
icons/,\
s60-skins/,\
plugin.properties,\
component.xsd,\
schema/,\
componentSystem.jar,\
data/,\
sourceFileHeader.txt
jars.compile.order = componentSystem.jar
source.componentSystem.jar = src/
output.componentSystem.jar = bin/