Add the ability to Zoom IN/OUT or enlarge the Playlist Timeline

The Playlist Timeline can be found to be quite small and users would like the ability to Zoom in and out of the timeline, plus be able to set the Timeline size so that it can be continually larger than normal. Being able to Zoom would allow you to see more assets on the timeline also should you be working with a Playlist with lots of assets and/or assets that have longer durations.