UI: Overall UI for MultiLayer

[jinningwang]

The below picture shows the current AGVis UI.

However, we might need to adapt this UI to feature MultiLayer.

1. The lighting button symbol stands for the power grid. The lighting button will control the power grid topology and all related animation layers with buttons $\theta$, "V", and "f". For easy use, let us call these "ANDES sets", maybe a drop-down list.
2. Similarly, "AMS sets", using the symbol (maybe a simpler one, but use this as reference) stands for static results visualization. There will also be several buttons, $ for Locational Marginal Price (LMP), for available capacity, F for power flow.
3. The WiFi button stands for the communication network (I guess, not sure).

We can come up with some draft overall UI first.