Create debug utility

[PMunch]

This should really have some better testing to more easily find bugs. If someone could write a simple dummy editor that just sends some jsonrpc messages and verifies the responses that would be really helpful.

[Asc2011]

i have started to integrate nimlsp into atom. the console in atom-ide-ui is waiting for 'nim' :)
So far, the autocompletions work.reference-lookup and jump-to-definition work, too.
linting-service is next on my list..

[PMunch]

Just implemented something like what I had in mind: 023b632. With this utility it's possible to record an editing session and then replay it. This could form the basis for feature tests as well as replaying specific bugs users have.

The utility is still a bit brittle though, it's easy to end up in a scenario where it hangs on waiting for data on the pipe, so there should definitely be some kind of timeout mechanism. Especially if we want to use this for automatic testing.