Guides CUA Timeline Guide and Demonstration

This update expands this guide and organizes it into 3 parts.

Part 1 centers upon triggering CUA, such as a fire particle effect
Part 2 adds triggers to activate sounds
Part 3 adds options to initiate the animation.

This update also adds three completed scenes for each of the 3 parts of the guide.

This update transforms this post into a 50 step guide. A Timeline CUA Setup scene has been added. Load up the setup scene and follow along with the guide to build a scene that turns a fire particle effect on and off. This update also adds a completed scene as a reference. The completed scene includes sound effects. An explanation for adding triggers that change the sound will be posted in a future update.