Silk Spawners

# Silk Spawners Enables to "silk touch" mob spawners and trial spawners, retaining all their data, and optionally allows regular players to place them as well. (Can be toggled with the `silk_spawner_skipCreativeOpCheck` gamerule) The enchantments that allow to mine and keep spawners data are defined by the `silk_spawner:can_silk_spawners` enchantments tag, and only include the `minecraft:silk_touch` enchantment by default. The mod can be used to allow keeping all block data of a block by using the `minecraft:copy_custom_data` loot function, and setting the target as `::block_entity_data`. For safety measures, the `silk_spawner_skipCreativeOpCheck` gamerule is only applicable to spawner block entities, to avoid anyone placing blocks with data such as command blocks.