Finish reactivity.go

[zaviermiller]

Currently, the file responsible for handling reactivity "works" but is far from complete. I need to:

• implement the rest of the types
• ensure calculators and mutators are thought out in their functionality
• update the render q to have some sort of proxy
• fix events so that they make sense
• custom component events
• finish thinking out iterative render cases and implement algs
• rework reactive data a little again lol (uggh)
• ensure API makes sense
• done?