Recurrent Complex Volts

**Added**
- Added admin command: `/#structures locate <structure-id>`
- Finds the nearest predicted Recurrent Complex natural/static structure spawn.

**Usage**
```mcfunction
/#structures locate <structure-id> [--radius <chunks>] [--dimension <id>] [--from <x> <z>] [--unchecked]
```

**Examples**
```mcfunction
/#structures locate RuinedTemple
/#structures locate RuinedTemple --radius 256
/#structures locate RuinedTemple -r 128 --from 0 0
/#structures locate RuinedTemple --dimension 0 --unchecked
```

**Options**
- `--radius` / `-r`: search radius in chunks. Default: `128`.
- `--dimension` / `-d`: dimension ID. Default: your current dimension.
- `--from <x> <z>`: search from these coordinates. Default: your position.
- `--unchecked`: skip chunks ReC has already checked/generated.