Install serve-d on demand

[aminya]

Integrate get-serve-d script into the the main code of the package instead of being an offline script

[aminya]

I feel like this approach is just more complex for no reason (e.g. all these manual downloading, decompressing, checking for versions, etc).

The better solution is to make an npm package for serve-d, so it can be easily installed as a dependency.

For now, I am going to bundle serve-d exe as part of the package.

Originally posted by @aminya in https://github.com/Pure-D/atom-ide-d/issues/40#issuecomment-785466820