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().
<!-- values for LAF keys that differ between softkey and touch styles: touch settings -->
<boolean key="is.softkey" value="false"/>
<boolean key="is.touch" value="true"/>
<boolean key="is.pen" value="true"/>
<!-- define fonts, colors, rectangles, integers below... -->