Add filter for cave wall ore generation

[thewho333]

Versions:

• Minecraft Forge: 43.2.6
• Geolosys: 7.0.10

What happens/the problem:

• Frustrating early game when you have very large and rare plutons.
• Config option for ores to generate in caves are "missing".

What should happen/the solution:

• Make it possible to generate ores in caves. Small but common plutons.
• There should be a pluton type suitable for generation in caves. Possibly a new "sizeMin" and "sizeMax" config option instead of "size"? Could maybe be solved by checking configured Y-level and only generate adjacent to air or other ores?

Other thoughts:

• Maybe add above as a section/child of the "normal" config. Would break current datapacks?.
• config == datapack

Config example:

{
  "type": "geolosys:deposit_cave",
  "config": {
    "yMin": -64,
    "yMax": 10,
    "sizeMin": 1,
    "sizeMax": 5,
    "biomeTag": "#minecraft:is_overworld",
    "blocks": {
      "default": [
        {
          "block": "geolosys:kimberlite_ore",
          "chance": 1.0
        }
      ],
      "minecraft:deepslate": [
        {
          "block": "geolosys:deepslate_kimberlite_ore",
          "chance": 1.0
        }
      ]
    },
    "generationWeight": 2
  }
}