Adjacent modifier(s)

[null2264]

Make it so that modifier(s) don't have to be at the bottom of the generated block, could also be adjacent.

Potential format:

// cobblegen.json5
<...Gen>: [
  {
    "id": "minecraft:stone",
    "weight": 1.0,
    "adjacent": true,  // enable "adjacent mode"
    // normal gens can have 4 neighbours, custom gens can only have 3 since "modifier" will also act as "neighbour" in adjacent mode
    "neighbours": ["minecraft:obsidian", "minecraft:bedrock"],
  }
]

// cobblegen-meta.json5
{
  "forceAdjacentMode": true,
}