* improved CWE476-check with dataflow analysis

Pre commit 

This builds cwe_checker and runs the test suite on Travis CI.

* Simple recipe for standard run

* Add dockcross for C++ x86 cross compilation.

* Add dockcross containers for all cross compilation targets

* reduced container size

* removed caching in install script

* size optimizations

Acceptance tests

This adds a check for CWE248: Uncaught Exception

--cwe-checker-partial=CWE476,CWE782 to just run the analysis for
CWE476 and CWE782.

checks. Ready to implement partial analyses.

docker optimized and markdown issues fixed

Merging refactoring of Docker container and cwe_checker_to_ida

system upgrade