Support for multiple filters per entry in remappedStates

[dktapps]

Since #6, oldState in remappedStates has been able to perform partial matches on states to apply transformations.
This has caused various issues:

pmmp/PocketMine-MP@8ccaf90
pmmp/PocketMine-MP@59d14de

To permit exact matching of a set of options without duplicating newState or other information, perhaps it would be a good idea to support something like this, which reduces duplication and takes less space:

{
    "oldState": [
        {
            "huge_mushroom_bits": {
                "int": 10,
            }
        },
        {
            "huge_mushroom_bits": {
                "int": 15,
            }
        }
    ],
    "newName": "minecraft:mushroom_stem",
    "newState": null,
    "copiedState": [
        "huge_mushroom_bits"
    ]
}

instead of having it like this:

{
    "oldState": {
        "huge_mushroom_bits": {
            "int": 10
        }
    },
    "newName": "minecraft:mushroom_stem",
    "newState": null,
    "copiedState": [
        "huge_mushroom_bits"
    ]
},
{
    "oldState": {
        "huge_mushroom_bits": {
            "int": 15
        }
    },
    "newName": "minecraft:mushroom_stem",
    "newState": null,
    "copiedState": [
        "huge_mushroom_bits"
    ]
}