v0.12.0

Complete rewrite of the library

• Add support for manipulating Property, Lexeme and Wikimedia Commons MediaInfo
• Rewrite the wbi_login module, each authentification method has now is own class.
• Add support for Structured Data on Commons (SDC).
• Replace custom debug with logging module.
• Add type hints.
• Remove WikibaseIntegrator.wbi_helpers property. Use directly wbi_helpers module instead.
• Improve datatypes code by removing redundant parts
• Improve useragent support.

Thanks to @dpriskorn , @pgrond , @jmformenti