fixed #231

PFeature.insertCoordinate now checks for snapped segments in
the FeatureCollection, and inserts the Coordinate in them too.

Before, this was done in the SimpleMoveListener, but not reliably
because the entity/ring/coord-indices wasn't calculate correctly.

The PFeature manages now also the Undo-Actions for AddHandle and
RemoveHandle.
Merge branch 'bug/231-addhandle-snapped-neighbours' into dev
Merge branch 'dev' of github.com:cismet/cismap-commons into dev
fixed #232

implementation of the PerpendicularIntersectionListener.
The DefaultColor and DefaultSelectedColor of PHandle can be
overwritten now.
Merge branch 'feature/232-PerpendicularAddhandles' into dev
issue #232 small fix. doubleclick on add handles selects the handle
Merge branch 'feature/232-PerpendicularAddhandles' into dev