Code refactoring & formatting

- [x] switch to typescript -- on going
- [x] add proper types for everything
- [ ] substitute lodash with ramda
- [ ] Refactor folder structure & names in some cases
- [ ] get rid of closures. They have a performance cost & encourage use of global variables
- [ ] selective imports from dependencies
> currently for convenience we have such imports import * as Plottable from 'plottable'; but ideally this should be something like import {Components} as Plottable from 'plottable';. We should only import what we use.
- [ ] break long functions into smaller functions