[Needs testing] Migrate Grow Limit editor feature to a more modern code
These changes needs to be tested on multiscreen setup with OpenMW-CS:
- Edit -> Preferences -> Windows -> Horizontal scrollbar mode for main window -> set Grow then Scroll
- Test with checked Grow Limit Screen checkbox and unchecked one
It would be nice also compare new behavour with one from master branch.
Edited by Andrei Kortunov