Block Extension QSL

[Azagwen]

This PR contains the base for a QuiltBlock Utility, which currently only has Property proxying (i.e creating blocks that "extend" multiple blocks, thus inheriting their blockstate properties)

To create a block proxy, you simply call QuiltBlock.createProxy() in its constructor, as TestBlock for the example mod shows.
QuiltBlock.createProxy() takes the block's settings, and an array of already registered blocks, the block settings are only used to be able to call the method itself, as this needs to happen at the super() call

public class TestBlock extends Block {

    public TestBlock(Settings settings, Block... proxies) {
        super(QuiltBlock.createProxy(settings, proxies));
    }

}

[LambdAurora]

Some notes:

• we use <Class>Mixin and not Mixin<Class>
• I feel like copyProperty should do checks to avoid copying something that cannot be copied
• getProxyDefaultState probably should be replaced with a more generic method called mergeStates(BlockState source, BlockState target).

Also don't forget to run the applyLicenses task!

[LambdAurora]

This usage of getProperty doesn't sound useful?

If the stuff that was merged were merged properly, it should already include the property.

[Azagwen]

Some notes:

• we use <Class>Mixin and not Mixin<Class>
• I feel like copyProperty should do checks to avoid copying something that cannot be copied
• getProxyDefaultState probably should be replaced with a more generic method called mergeStates(BlockState source, BlockState target).

Also don't forget to run the applyLicenses task!

How would you generify getProxyDefaultState?

I struggle to see any ways to 100% generify this method in particular, as it's currently not possible to target a single Proxy and it needs to get all of them in a loop to gather teh default states.

Unless I create a new method to mergeStates and use it in a refactor of getProxyDefaultState which does loop through proxies?