Investigate typescript quirks + project architecture

[cannawen]

• [x] stale files in dist directory when src restructured using rimraf
• [x] Long time to eslint typescript
• [x] File names: upper or lower case? A: Class = uppercase; otherwise lower case
• [x] Use import { thing } from "./thing" and thing notation or import thing from "./thing" and thing.thing as needed
• [x] Where do tests go? Beside the file, on in a separate test directory with parallel structure? beside
• [x] TypeScript : Put a list of Objects implementing InterfaceA and InterfaceB mixed in an array. How to tell them apart again? (example) figured it out.
• [x] How to use enums type safely? Turns into a string upon returning from a function (example)
• [x] EventHandler* should not return SideEffect directly. Should pass through some intermediary structure & TimeHandler should turn the stuct into a SideEffect done
• [x] Refactor to observer design pattern done

[cannawen]

1. Refactor to use a publish/subscribe event messaging system using broker (inspired by kafka)
2. Refactor to use a rules-based system to handle state using Engine (inspired by o'doyle rules)
3. Make sure no one can change db without using proper methods (use immutable.js or something)

---done---