webhook: integrate bot instance with Bottle#29

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HumorBaby wants to merge 3 commits intosopel-irc:masterfrom

HumorBaby:feat-bottle-sopel

Commits on Aug 11, 2019

webhook: implement middleware to inject bot instance into environment
HumorBaby
committed
webhook: implement Bottle plugin to pass bot instance to route callbacks
HumorBaby
committed
webhook: rm `global sopel_instance`; pass bot if `bot` parameter present
HumorBaby
committed