Casts can hide some type errors

Don't use `Function` as it allows any sort of calling pattern

Calling `fire` with zero arguments results in the emitter firing with `undefined`. This is often not expected or desired. It should be explicit that the emitter is fired with undefined

Switch to use a more explicit, more state-machine like approach to states for code actions

Replace all void 0 with undefined

Update copyright year to 2019

Define less fonts

See https://github.com/Microsoft/TypeScript-TmLanguage/issues/691

Assuming that properties named `label` or `name` are dom properties is incorrect and causes a lot of false positives. This results in weirdly inconsistent colorization