WIP: use compilation mode for error buffer

[dahtah]

I ported a nice feature of julia-repl by @tpapp: compilation-mode is now enabled in the error buffer. Example in screenshot below.

Also, I'm a complete beginner in elisp, so comments are welcome.

[tpapp]

If that is preferred, I am happy to factor out this part and put it on MELPA so that it is easier to share/maintain.

[dahtah]

Thanks for your comments! I'm always happy to learn something new, so I tried to fix things myself, let me know what you think. The next thing is to enable compilation-minor-mode in the vterm buffer, which may be quite useful when using Revise.jl. Any advice?

[gcv]

Nice work!