Added a simple check that prints an error message when no dynamic symbol calls could be resolved.

Added brand new (and still experimental) checks for CWEs 415 and 416 together with a new interprocedural data-flow analysis engine written in Rust. Add `-partial=Memory` as command line flag to try out the new checks.

Added a new symbol structure enabling more precise handling of extern symbols.

refactored cwe476 to add stack tracking

Initial version of type inference. It is still very rudimentary at the moment since it just tracks pointer but it's a very solid start! 

* Initial version of Type inference