Add support for non-incremental mode
Created by: jad-hamza
Thanks @samarion for the help
Built on top of https://github.com/epfl-lara/inox/pull/137
I wonder now if it wouldn't have been better to make new solver names such as noinc:smt-z3
instead of one global option.
That way we could mix incremental and non-incremental solvers in one run.
But this will do for now, I'll that for a future PR.