Feature/x3 devlop merge

This is the merge pull request to pull all the changes left behind in the x3-devel branch to the develop branch.

I had to add support for the no_case directive to the numeric/bool parsers for everything to work. 
The bool parsers require the character encoding information, which can be passed, 
- on the parser level (the current implementation)
- on the policy level

Both would work, it's only an API definition choice.