Earthquake animation for Call Building

[tedbarnett]

• 703 Market Street
• Deliver: Unity prefab with destruction animation
• You can start with current 3D model (in Github: "Call Building.skp" or whatever is the most recent Call Building). Use this to build a "destroyed" version of the building after the earthquake.
• Sound FX not required (added elsewhere)
• Add trigger event in TimeWalk.cs script so that this animation can be started when earthquakeTime is reached.