Replace all report() calls with logger use

* Deprecates report method in Net::YAIL and IRCBot
* Replaces report() with @log.info in most cases, and @log.warn /
  @log.error in a few situations where it makes more sense
Lower logger level to info

I think this is more typical of typical usage of a logging system...?
In YAIL, info reports were *very* few prior to the fixing of all report
calls, so I think this is safe.
Fix report_events.rb direct access of @log
Merge branch 'feature/fix-irb-bot-logging' into develop