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xml:lang we set on the stream is inherited

getdefaultlocale() is not a good way for determining the users configured language

Let the client figure it out and pass it to nbxmpp

- Parse more MUC features

- get affiliation
- set role
- set affiliation
- set config
- set subject
- cancel config
- request config
- send captcha
- decline
- request voice
- destroy
- invite

- Adds also a Bits of Binary (XEP-0231) module

start and end of range are not included

- Move structs into own module

- Add BaseMessage handler
- Add enums for message and presence types
- Add enum for presence show
- Add detection for muc subjects

This reverts commit 5b825b3b.