Aligned Auth Scopes with Twitch docs

[Bukk94]

Auth Scopes fixes

• Added documentation to Auth Scopes
• Moved ScopeToString method from PingResponse to Helpers so it's together with other parsing method
• Corrected old chat:moderate to channel:moderate in ScopeToString (this was forgotten in the previous PR)
• Removed scope user:edit:broadcast which is no longer valid
• Removed all old v5 scopes (like openid, channel_read, or channel_editor)
• Added new Auth scopes:
  • Channel_Read_Guest_Star - channel:read:guest_star
  • Channel_Manage_Guest_Star - channel:manage:guest_star
  • Channel_Manage_Raids - channel:manage:raids
  • Moderator_Read_Guest_Star - moderator:read:guest_star
  • Moderator_Read_Shield_Mode - moderator:read:shield_mode
  • Moderator_Read_Shoutouts - moderator:read:shoutouts
  • Moderator_Manage_Guest_Star - moderator:manage:shield_mode
  • Moderator_Manage_Shield_Mode - moderator:manage:guest_star
  • Moderator_Manage_Shoutouts - moderator:manage:shoutouts
  • Whisper_Read - whispers:read
  • Whisper_Edit - whispers:edit

Minor improvements

• Updated TwitchPatchAsync in ApiBase to return KeyValuePair
• Updated ModifyChannelInformationAsync in Channel to return bool if the modification was successful.
• Extended .gitignore to ignore JetBrain's Rider files
• Updated C# language from 7.3 to latest

[neon-sunset]

Thank you!

[swiftyspiffy]

LGTM