Bring Base Metals to Minecraft 1.17.1

[SkyBlade1978]

I've brought the released 1.16.5 version forward to Minecraft 1.17.1 and Forge 37.1.1. This is Base Metals 3.1.0.117011, using Java 16 and the published OreSpawn 4.1.0.117011 release.

The main changes are:

• Metal ores now drop raw material, with Fortune and Silk Touch support. Direct hammer mining still gives two powders; each raw piece gives one powder and can be smelted or blasted into an ingot. Raw metals cannot replace powders in alloy blends.
• Copper uses vanilla raw copper. Base Metals copper generation is off in new OreSpawn profiles, but saved profiles and explicit overrides keep their settings.
• Kiri's ore overlays now use Forge's native model generation. The vanilla backgrounds, attribution and tested overlay gap are retained.
• Doors, trapdoors and bars no longer hide the floor or wall behind their holes. Their collision shapes and placement are unchanged.
• Old-world migration removes stray bed entities created on modded blocks during flattening, and protects saved terrain in the Nether, End and custom dimensions as well as the Overworld.

High/Low Fantasy, both configuration entry points, armour effects, material arrows and bolts, plate repairs, trades and filled molten buckets are carried forward. Existing registry names and saved items are kept.

The local checks include 68 unit tests, packaged client and server fresh/reload tests, both content modes and login checks, Mineralogy coexistence, and separate upgrades from Cyano 1.10, MMD 1.10, MMD 1.12 and the 1.13–1.16 ports. Original worlds were left untouched. The release jars are audited for unwanted files and compared across two clean builds. I've also finished the in-game testing.

The README, changelog and guides have been updated for this version. Agent notes and generated test output are not included; permanent tests and migration fixtures remain outside the published mod.