Variable controls and Switch toggling

[melody-rs]

Is your feature request related to a problem? Please describe.
In RPG Maker, you'll often want to see what a map will look like depending on the value of a switch or variable. You need to go in game for this, and can't get an accurate view of the entire map without extra hacking.

Describe the solution you'd like
Add a UI to Luminol that'll allow you to toggle switches and set a specific value for variables. Events, common events, etc, all react accordingly, and Luminol provides you some information about what the switch changes.