Versions: Lit-Element to 2.4.0 and Lit-HTML to 1.3.0

Replace with the event bus for now

This fixes a typescript problem and allows us to enable type checking
in the typescript-example package (by removing the ts-nocheck comment)

lerna complains about this

And remove the custom publish commands

It's nice to have to aborting requests and adding timeouts to them.
This is in theory supported in all browsers covered by other checks,
but Safari 11.x had a broken implementation.

Fixes #38