Migrated all serialization and deserialization from Newtonsoft.Json to System.Text.Json across the codebase for improved performance and reduced dependencies. Updated package references and refactored helper method names for consistency (e.g., IsEmpty, NotEmpty, InRange). Also updated NuGet package versions in project files.
Merged IM and Chat command groups.
Changed return hints for failures to ReturnHintsFailure so the wiki make can mark errors.
Added missing arg hints for Notecard commands.
Added new NotecardDirectSend command for speed runners.
Improved About info for GroupAddRole command.
Corrected About info for GroupInvite command.
GoHome command moved to self workgroup.