OpenMW-CS: Instance drag out of scenes
When in instance editing move sub-mode, an instance drag out of the window should be turned into a regular cross-window ID-drag.
Note: This task requires a properly working camera to be implemented first.
(RM-3169 from redmine: created on 2016-01-26 by Marc Zinnschlag, , relates #3000 (closed), relates #3168)
Edited by redmine