feature collection cleanup

[jodygarnett]

Remove references to deprecated feature collection methods, that are now removed from GeoTools.

• Remove CollectionListener methods (addListener, removeListener)
• Remove Iterator Methods (iterator, close, purge)
• Remove Collection Methods (add,adAll,clear,remove,removeAll,retainAll)

For more information see geotools/geotools#44

The cleanup went smoothly for uDig ... except for TableView.

Had to migrate from FeatureCollection/CollectionListener methods (which are gone) to FeatureSource/FeatureListener methods. This may mean we need to ask TableView to latch onto a FeatureSource now

So testing is needed

[jodygarnett]

Yeah we will need this when we update to a newer version of GeoTools.

Give the package name changes we will have to redo the work file by file, still it did not take too long the first time.