Better wrapper helper

[rajdakin]

This PR:

• greatly improves the output of the wrapper helper, by not changing ignored lines;
• should make the Makefile compatible on more platforms (using fd redirection instead of |&);
• implements some more features in the parser (inline and _Noreturn);
• allows for explicit type mapping (using the #pragma wrappers type-letters pragma), for example mapping FILE* to type letter S