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().

Localized-friendly=Canadian french friendly name
loc-name=Canadian french name property
loc-abc=Canadian french abc property
loc-red=Canadian french red enum value