Bring Base Metals to Minecraft 1.15.2

[SkyBlade1978]

This brings our 1.14 release forward to Minecraft 1.15.2 and Forge 31.2.57.

The blocks, items, recipes and save identities are unchanged. High and Low Fantasy, both config buttons, the armour effects and the old-world migration support are still there.

• Update ore overlays, bars, doors, trapdoors and molten fluids for the 1.15 rendering changes. Kiri's overlays still use the vanilla host textures, including resource-pack replacements.
• Register the arrow and bolt renderers separately. Bows fire arrows and crossbows fire bolts, including their free iron bolt in Creative mode.
• Use the published OreSpawn 4.1.0.115021 release, with its file ID and checksum pinned. The eleven ore rules are unchanged, and there is still no second ore generator.
• Keep ForgeGradle 7, the Java 8 game runtime, reproducible builds and working Eclipse and IntelliJ launches.

I've checked the README, changelog and files going into this commit. Agent notes, generated worlds and test output are ignored; the test probes and reference files stay out of the release JAR.

Local checks passed: all 63 unit tests, packaged client and server tests, fresh worlds and reloads, content-mode connections, Mineralogy coexistence, and two byte-identical release builds. The separate Cyano 1.10, MMD 1.10, MMD 1.12, 1.13 and 1.14 upgrade tests also passed, with the original worlds left untouched.

The release version is 3.0.1.115021.