WIP: Improvement/better errors

[ajuvercr]

Many things.

Mostly rewrite the recursive descent parser, but I'm not happy with it yet.

This parser is faster most of the times and returns some kind of errors.

Also adds a profiler, set env PROFILE=true, this creates a file /tmp/prof.json with profile things. To use this file, fix the json by adding ]} then insert the file in chrome://tracing/ in chromium and enjoy.

[ajuvercr]

TODO:

• integrate into mu-auth currently only the implementation is present (with tests) but the actual mu-auth doesn't use it
• actually make errors better
• according to the sparql docs, the grammar is parsable with a LL(1) parser, maybe look at that? Should bring better performance and better errors