Add Tsc lint

[Duddino]

Abstract

Add typescript linting. It takes type information from jsdoc comments, or is able to deduce it itself
For instance:

function test(hi) {
	return Number.parseInt(hi);
}

Will automatically mark the function as test(hi: any): number.
Added @typescript-eslint/no-floating-promises, the lint will now catch non awaited promises. If the behavior is intentional, .then(()=>{}) can be used.

[JSKitty]

The changes generally look good - nice cleanup! Only one nit, applying to a comment.

However, on a clean dev build, getting a runtime error!

# After switching from Master to #130
npm ci
npm run dev

[Duddino]

I encountered that bug in #121 but forgot about it. If we look at the code (in master) we are importing the wallet first and loading the network after that, it only worked because the wallet code was async and the settings code wasn't (and we weren't awaiting), since the scheduler waits for the tick to finish it would execute after the network and work. This is the reason I added no-floating-promises, so we can't have these confusing things that break when you make the function async

[JSKitty]

tACK e0fb36d, working now - no errors, the extra hardened typing will certainly help prevent many future MPW bugs, great job!! 💜 💪

[Liquid369]

tACK 27cf487

Went through this a few times! I did not really encounter any issue gg LGTM

[Duddino]

Closing as stale