Generalize nick addressing (foo: and @foo) #6
Description
Currently nick addressing (the bot figuring out which user to address in its respose to inline commands) only works for our custom commands in MrFisk, it does not work for e.g. the !google command.
Figure out a nice clean solution for abstracting and generalizing it so that it can be moved out of our own custom plugin and be applied to other plugins as well (most likely it will be a plugin in itself).