VIRA-283: Syntax for code highlighting

[n0v1c3]

Hello @junegunn,

https://github.com/n0v1c3/vira/tree/VIRA-282 is the branch currently in process and will only make it to dev or master from there. This is currently an issue just for the syntax.

Bellow I just wrote before looking at your code but there should still be some useful lines in it for you.

The viraGVCode bellow is the example that will capture the code inside the "Message". I am sure I am not the only person that has `` in their messages and GitHub definitely supports it as well. We cannot fall behind there.

syntax region viraGVCode start="`" end="`" contained

UPDATE: Found my own bug to deal with so left only the line that mattered.