Bring Base Metals to Minecraft 1.19.4

[SkyBlade1978]

This brings Base Metals to Minecraft 1.19.4, keeping the features and fixes from the 1.18 release.

• Keep raw metals, Kiri's ore overlays, filled buckets and High/Low Fantasy modes.
• Update creative tabs, fluids, rendering, recipes, loot, configuration screens and networking for Forge 45.
• Save GUI changes together so Forge's file watcher cannot undo quick consecutive edits.
• Keep existing registry IDs, ore rules and copper defaults. Older worlds retain their blocks, inventories, equipment and advancement progress.
• Fix the obsolete vanilla biome registry snapshot encountered when upgrading older Forge worlds, with a backup before conversion.
• Require the published OreSpawn 4.1.0.119041 release. Optional mods without 1.19.4 builds stay out of normal launches; their integration data is retained.
• Update the README, changelog and build documentation. No agent notes or generated test output are included.

Local checks passed: 69 unit tests, 39 GameTests, packaged client/server fresh and reload tests, both content modes, matching and mismatched connections, separate upgrades from Cyano/MMD 1.10 through 1.18, generated data, artifact audits and Eclipse isolation. Two clean builds produced identical release jars. The 14 saved-world comparison tests also pass. The GUI test repeats its edit/save/cancel sequence eight times to cover the Linux CI failure.

Release version: 3.1.0.119041.