Independent Frame and Pane of (2D) Vis
|Assignee:||Hrstka Ondřej||% Done:|
Split Vis singleton into VisFrame and VisPanel (not singletons) to allow:
(a) inserting vis into external Frame (GUI window)
(b) having more vis Frames for one universe
(c) having more vis Panels for one universe
Vis has to stay because of backward compatibility (should be deprecated).