Code refactoring & formatting

[epicallan]

• switch to typescript -- on going
• 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