Convert remaining == null to is null and != null to is not null
across 17 files in CommandHandler/ArgumentType, StructuredComponents,
and DeclareCommands for idiomatic C# style.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Add AttributeSubComponent121 that uses ResourceLocation(string) instead
of UUID+Name, matching the 1.21 attribute modifier wire format change.
Register it in SubComponentRegistry121 via new ReplaceSubComponent method.
- Add ProjectilePower packet handler: reads 1 double (accelerationPower)
for 1.21+, or 3 doubles (xPower/yPower/zPower) for 1.20.6.
- Add CustomReportDetails and ServerLinks packet handlers in both Play
and Configuration phases, consuming all fields to prevent byte offset
errors on 1.21 servers.
Made-with: Cursor
