Add support for middleware (ie, input/output hooks) about skybot HOT 4 CLOSED

I updated the example hooks to add an implementation of sklnd's censoring filter. It runs as an output filter, and replaces specific words with [censored].

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After looking at sieves closely, I realized input hooks are basically exactly the same as a sieve, since a sieve can modify the input at will, and if it returns None, processing stops.

Doesn't change the fact that output filters would be useful to have!

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This could be useful for supporting other protocols. My jabber changes were not very pretty.

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Why is this stupid thing still open? I even deleted my fork.

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