Added context menu to reload and unload index and task engine for a project.
automatically deleting .sdf3 files in src-gen and <Lang>-jar.jar before building to fix Windows issue
Work around NPE in SetOnlyMarkersPrimitive, a proper fix does not seem to be possible with this architecture.
add properties necessary to run Ant Macros to upgrade Spoofax wizard
Merge branch 'master' into core

Conflicts:
	org.strategoxt.imp.runtime/plugin.xml