This commit is largely based on work by Thiago Arrais (@thiagoarrais)
and Shane Bradfield (@l33tLumberjack). I wasn't really able to get their
PR reasonably merged onto the latest master, so I reapplied their changes
manually here and did some further improvements on that.
- 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- Fix outdated documentation of command-line options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
