Optionally intercept Bucket ignore/unignore commands

[dgw]

It might be possible to listen for Sopel, ignore <nick> (Sopel, unignore <nick> and pass the nickname on to the function for .blocks add nick <nick> (.blocks del nick <nick>). It would simplify ignoring users somewhat, because one command would the affect both bot frameworks.

Should be configurable, and defaulted to off, because most users aren't going to have Sopel installed alongside Bucket behind a bouncer…

Probably going to implement in stages:

• Implement hardcoded listening for Bucket commands
• Add configuration option (module has no existing config)
• Expand config to allow custom definitions of what to listen for, maybe with Bucket rules as defaults

This was originally conceived of as a separate module, but I'd be OK with implementing it here first, at least. After all, this module was originally just a command buried in BombBot.