Composition layer

[Oaktown]

A picture is worth a 1000 words but I will want to add a few notes:

• - Triggering the clips on the "COMPOSITION" layer would trigger all clips below
  - The "COMPOSITION" clips would have the same transport controls as we currently have a regular clip including the ability to set the duration and auto-pilot giving us access to a pseudo time

Another way to implement this new feature would be to have "layer router" clips that can trigger the column they are in when triggered.