[PATCH] Convert actions which extend `AbstractAction` to ones which extend `JosmAction`

[taylor.smock]

We should try to ensure that all actions (especially those that some users may want to bind to shortcuts) extend JosmAction.

The affected dialogs and actions are as follows:

• ChangesetDialog
  • SelectObjectsAction
  • ReadChangesetsAction
  • CloseOpenChangesetsAction
  • ShowChangesetInfoAction
  • LaunchChangesetManagerAction
• CommandStackDialog
  • SelectAction
  • SelectAndZoomAction
  • Undo/Redo actions (since these are distinct from the global undo/redo action -- will undo/redo to the selected command)
• FilterDialog
  • AddAction
  • EditAction
  • DeleteAction
  • MoveUpAction
  • MoveDownAction
  • SortAction
  • ReverseAction
• MapPaintDialog
  • OnOffAction
  • MoveUpDownAction
• NotesDialog
  • AddCommentAction
  • CloseAction
  • NewAction
  • ReopenAction
  • SortAction
  • OpenInBrowserAction
• RelationListDialog
  • NewAction
• UserListDialog
  • SelectUserPrimitivesAction
  • ShowUserInfoAction -- this calls a different super constructor actually

I don't see most of these getting shortcuts, especially official shortcuts, but some people on various chat channels have mentioned that they would like to have a shortcut for creating a new relation.

The current patch primarily focuses on actions for toggle dialogs.