Pydiscourse

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- Add some PR guidance
- Add support for files in the core request methods
- Adds numerous new API controls, including:
- tag_group
- user_actions
- upload_image
- block
- trust_level_lock
- create_site_customization (theme)
- create_color_scheme
- color_schemes
- add_group_members
- group_members
- group_owners
- delete_group
- create_group
- group
- customize_site_texts
- delete_category
- user_emails
- update_topic_status
- create_post
- update_topic
- update_avatar
- user_all

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* Place request parameters in the request body for POST and PUT requests.
Allows larger request sizes and solves for `URI Too Large` error.

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* Adds method to add user to group by user ID

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* Adds badges functionality

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* Adds initial groups functionality

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* SSO functionality fixes