v0.12.0.dev5

Changes since v0.12.0.dev4

• Add type hints
• Remove WikibaseIntegrator.wbi_helpers property. Use directly wbi_helpers module instead.
• Add GitHub Actions for isort/mypy and pylint
• Improve datatypes code by removing redundant parts
• Use f-string (Suggestion of @dpriskorn)
• Correct api parameter in entity classes
• Change references handling in Claim/BaseDataType classes
• Add retry if remote server return 500, 502, 503 or 504 http code
• Better support of bot flag in wbi_helpers functions
• and more...