Adding blocks to assembly blacklist

Since 0.3.0 physics assembler has a blacklist of blocks that cannot be assembled. This list can be expanded via datapacks. Here is a step by step guide how to do this:

1. Create a data pack
2. Add data/createpropulsion/assembly_blacklist directory
3. Add a json file for your blacklist (for example minecraft.json) that looks like this:

{
    "blacklist": [
        "minecraft:spawner",
        "minecraft:end_portal_frame",
        "minecraft:barrier",
        "minecraft:bedrock",
        "minecraft:end_portal",
        "minecraft:end_gateway"
    ]
}