Moved time slider panning to time label and some bug fixes.

Bug fixes
- Jump to next time will now jump the current maximum time if current
time is greater than the max model time
- Moving time ticks will now correctly update the scene graph.
Time control's time label will now be shown at the time slider's fill
Time ticks can now be grabbed instead of just being pushed.
Feedback message now appears in the middle of the canvas
Floating time label will now appear at the slider's fill whenever time is changed, and when interacting with time ticks