This does a number of things (sorry):
* Estimates the type changes needed to the dispatcher (later to be replaced by https://github.com/matrix-org/matrix-react-sdk/pull/4593)
* Sets up the stack for a whole new room list store, and later components for usage.
* Create a proxy class to ensure the app still functions as expected when the various stores are enabled/disabled
* Demonstrates a possible structure for algorithms
Includes: compilation, translations, IDE support (use .tsx not .ts), typings, and other build tools.
TypeScript component have to import PropTypes and React with `import * as React from 'react';`
