Blender Git Loki

Graph Editor: F-Modifiers can now be added to multiple selected F-Curves at once with the Ctrl-Shift-M hotkey.

* All the selected F-Curves will get the same type of F-Modifier added.
* The button in the properties region will still only added the F-Modifier to the active F-Curve though
* For now, there must be an active F-Curve in either case, otherwise the poll() callback fails.