Adds a string abstraction analysis and includes a rewrite of the CWE-78 check using the new abstract string domains.

* Remove old Ocaml files

* adjust makefile

* Remove BAP build instructions from Readme

* minor documentation fix

* Remove old Ocaml documentation

* Remove unused Travis CI files

* Move Rust and Java code into src directory

* adjust build scripts to new folder structure

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.

Each unit test can now be run with a separate test binary, making all unit tests more flexible.