Manifest generation and error handling

🚨 Breaking

• Removed StreamDeckAction.Initialized event, please use StreamDeckAction.WillAppear
• Removed StreamDeckAction<TSettings>.Settings to prevent misuse.

⭐ Added

• Added automatic manifest generation!
• Added support for initializing actions with their AppearancePayload.
• Added action context when raising StreamDeckClient.Error (where possible).
• Added support for FontFamilyType and FontStyleType.
• Improved deadlock prevention for all WebSocket requests.

🐞 Fixed

• Fixed DeviceType, PlatformType, and TitleAlignmentType.