Irc3

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- Allow to use `irc3.rfc.*` as `iotype='out'`

- Use more pop in userlist to avoid bug when a weird event occurs

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- Use pop in userlist to avoid bug when a weird event occurs

- Expend filename path in logger plugin

- Force latest venusian version

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- Rename async plugin to asynchronious so we can use it with python3.7

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- Allow to have more than one `[bot]` section in config file

- IrcString now allow to retrieve username/hostname from mask

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- Do not show builtins command in help. Fixed 167

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- Backward incompatibility: async is renamed to asynchronous for py37 compat
(thanks to JulienPalard)

- Except a KeyError on missing twitter configuration in social plugin