* SS14-17313 Chat Censorship Systems
Adds some systems to manage chat censorship:
1. No-op: does nothing
2. SimpleCensor: a regex-free censor with a variety of rules to use
3. RegexCensor: a censor that uses regex.
This exposes a singleton backed by a builder pattern (ChatCensor) that
is set up, probably during the code init phase, and then globally available
for your censorship needs.
* Migrate to Shared
* Add a reset function to the builder.
* Resolve PJB's feedback; add unit tests
