Advances #78731: Added tool to delete selected features (in owned layers). Modifications to the SelectFeatureAction tool were needed to add an event that is fired when the features selected change, as deletion of selected features is only possible if there are selected features.

Also, the selection has been changed so the user can select features in layers not owned, which will be needed latyer for tools such as buffer.
Merge pull request #112 from luisromangz/8.5-SNAPSHOT-78731

Advances #78731: Added tool to delete selected features (in owned layers...