The primary motivation here (and for all the other moving around) is to present
a clean "front of house" to library users, and to migrate primary objects to
the top of the module hierarchy.
- Hide links to internal code listings, and link to github instead
- Improve formatting of code/example captions
- Fix outdated documentation of command-line options
- Complete documentation of all events + improved formatting
- tcp_open -> tcp_start, tcp_close -> tcp_end to reduce confusion
