Fold loom-tools into maven-sar

Currently the only class in loom-tools is the SarTask. This could quite easily be migrated into the maven-sar plugin. The maven-sar artifact produced can be used to run ant tasks or be installed into the maven runtime. As I think it would be simpler to combine the two rather than having a 1-class jar as a dependency of the plugin I would like to merge.

However you didn't think this was a good idea last time so I assigned to you and let you decide