Manual zoom improvements

Manual zoom operations are finally easy to do. Just add a Zoom section to the timeline, switch it to manual, and see a new interface for focusing the zoom lens.

The UI for automatic and manual zoom was improved. Confusing zoom points of interest were removed from the interface.

Timeline display updates

Small, barely noticeable update to the timeline editor. Removed the horizontal line separating time marks from the clip chunks on the timeline.

Changelog preview window

Adjusted up some padding to make it look better

Bugfixes

• Export pipeline stalls. Sometimes, the rendering pipeline could stall and require you to cancel the export and start it again. This is now fixed.