* Cleanup and reorg of lib/common
- remove stale code in helper.cpp
- move helper.hpp to demangle.hpp
- move helper.cpp to demangle.cpp
- update CMakeLists.txt with new filenames
- fix includes in config.cpp
* Remove log.hpp and join.hpp
- replace with glog and fmt
* Update lib/common/environment
- move implementation functions into cpp file
* Common library tests
- tests for demangling
- tests for mpl (template metaprogramming)
- tests for environment
Jonathan R. Madsen