Parse most if not all expressions

Signed-off-by: Josh Kilmer <srjek2@gmail.com>
Add shift operations to preprocessor

Signed-off-by: Josh Kilmer <srjek2@gmail.com>
Add another experimental program designed to safely (from a security standpoint) run untrusted programs. Coded mostly in comments atm....

Signed-off-by: Josh Kilmer <srjek2@gmail.com>