fix language syntax highlighting and completion

[nics]

fix language syntax highlighting and completion files for vi and ?

[vpeil]

see example for Atom:
https://www.sitepoint.com/how-to-write-a-syntax-highlighting-package-for-atom/
http://manual.macromates.com/en/language_grammars.html#naming_conventions

[jorol]

see also:
https://www.sublimetext.com/docs/3/syntax.html
http://docs.sublimetext.info/en/latest/extensibility/syntaxdefs.html#your-first-syntax-definition

[nics]

I added a simple vim syntax definition for the fix language in misc/
set syntax=catmandu-fix