allow plugins to access information about active submap
User should be able to determine which map is active (on top). Moreover there should be possibility to register listeners for submap events:
- open submap
- close submap
- focus on submap
- move submap dialog
There should be also possibility get information about location on the submap in the window.
Resize of the dialog is handled by default resize listener.
required by @ambak
Edited by Piotr Gawron