Support Eclipse Che using the language server

[gaocegege]

Che supports language server natively, and we need to write a LS agent for coala language server and launch it in che. See https://www.eclipse.org/che/docs/6/che/docs/language-servers.html for more details.

[gaocegege]

Che is based on Docker and we could build a sidecar for the LS: https://www.eclipse.org/che/docs/6/che/docs/language-servers.html#ls-sidecars

[ksdme]

I don't think it is logical to do that in coala-vs-code's scope. I mean we should develop a neutral coala lang server and then support Che or any other editor using specific means.

[gaocegege]

Yeah, that is what we need. But we do not have such a repo for language server so this issue is placed in this repo.