Neptune using legacy material support

[Biquaternions]

At the moment, Neptune logs a warning about the plugin requiring legacy material support.
I enabled debug mode in server.properties to force it to throw an exception and see what part of the plugin is causing it.

https://pastes.dev/hvyaiwz4bS

The reason comes from methods like this, that call Material.values() instead of using the Registry (bySuffix also uses said method):

    public List<Material> getAllItems() {
        List<Material> list = new ArrayList<>();
        for (Material m : Material.values()) {
            if (m.isItem() && !m.isAir() && !m.isLegacy()) list.add(m);
        }
        return list;
    }

Example using the registry, note the isLegacy validation is no longer required:

    public List<Material> getAllItems() {
        List<Material> list = new ArrayList<>();
        for (Material m : Registry.MATERIAL) {
            if (m.isItem() && !m.isAir()) list.add(m);
        }
        return list;
    }

I didn't make this into a pr because idk if this is intentional, I see the registry being used in other places.
Lmk if I should make one.