Refactor timeline.qml.
Fix drop rectangle track alignment for timeline vertical scroll.
Move the timeline toolbar above the ruler.
Add ripple delete to timeline toolbar.
Add insert and overwrite for drag-n-drop to timeline.

Replaces append action - unsure whether to keep that somehow. Added
timeline toolbar toggle buttons to toggle ripple (insert) and toggle
snapping.
Add "Scrub Drag" to timeline toolbar.
Fixing Ising generator params.
Load Properties when shot selected on timeline.