Add all mosquitto files unchanged

- Add all mosquitto files unchanged
- Add external_reference for external reference
Remove non-core files of mosquitto broker, passed install, uninstall, and library test

- Remove python, cpp, javascript library
- Remove client codes
- Remove mosquitto_passwd
- Remove CMake files
- Remove test files
- Remove examples files
- Remove doc files
- Remove man files
- Remove misc files
- Change Makefiles to fit changes
- Disable SSL/TLS
- Change really to reallyclean in lib's Makefile