chore: standardise repository for TFMC

[ryanbarlow97]

Summary

Brings the new Gathering repository in line with the other TFMC plugins.

• Build: Java 21 / paper-api:1.21.10-R0.1-SNAPSHOT with main-SNAPSHOT and the shared POM layout. The Windows systemPath jars and the antrun copy step are removed.
• Dependencies: TLibs 2.0.1 and RPCharacters 2.0.2, the latest releases, installed by the shared installer. MMOCore 1.13.1 and MythicLib 1.7 come from ServerAssets 183a187 and are checked against .github/dependencies.sha256. Gson comes from Paper.
• Code: imports now use the lowercase net.tfminecraft.tlibs and net.tfminecraft.rpcharacters packages. Biome names are looked up in Paper's registry instead of the removed Biome.valueOf, so unknown names still log a warning.
• Repository: adds the shared Build and Release workflows, artifact check, .gitignore, .editorconfig, Artistic-2.0 licence and README.
• Descriptor: version: '${project.version}' and api-version: '1.21.10'.

Docs: TF-Minecraft/Docs (Gathering guides, linked separately).

Validation

• mvn clean verify passes locally on Java 21.0.12 / Maven 3.9.11 with the pinned inputs; no unit-test suite.
• .github/scripts/plugin-artifact.py accepts the runtime JAR; the embedded plugin.yml has the Maven version and api-version: '1.21.10', and the classes are Java 21 bytecode (major 65).
• The default build prints no compiler warnings. With -Dmaven.compiler.showDeprecation=true, the only warnings left are legacy string UI calls (setDisplayName, ChatColor and similar), which other TFMC plugins also still use.
• GitHub Build workflow passes with the private inputs downloaded by DEPS_TOKEN.
• No live server run. Runtime checks are listed in the Docs guide.

Most of the diff is CRLF-to-LF normalisation. Review with whitespace hidden (?w=1).

Found during review, not changed here

• /gathering reload doesn't restart the spawn, discovery or particle timers. Interval changes need a restart.
• Spots never expire. spawnedAtMs is saved but never read, so a type that reaches max-active stops spawning until its spots are gathered.
• Spawning loads chunks with getChunkAt on the main thread, which also generates missing chunks within the bounds.
• One failed probe excludes the chunk for every spot type.

🤖 Generated with Claude Code