We might want to support more than one API version in the future.
Prepare for that.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

I almost made this a header-only library. should I make the switch now?

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

Support for offline precomputation, without
overhead if not needed.

Not tested yet.

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>

used cppcheck, valgrind on the examples.

fix the C interface free(), the example, the build type select.

update the cppcheck files, add the clang scanbuild script

Signed-off-by: Luca Fulchir <luker@fenrirproject.org>