Bag of Yurting

* Block data "stored" in the bag of yurting is now stored separately, in the world folder (instead of in the itemstack itself), significantly reducing the amount of data that needs to be copied whenever the bag itemstack moves to a new inventory slot. Thanks to alesharik for this improvement!

** Existing bags of yurting will still work; they will unload their data normally and use the new system next time they're used to store data

* Added an API for saving/loading block entities with position/rotation-sensitive data, see the wiki link above for details on depending on Bag of Yurting in a mod workspace

* The upgrade recipe is now shapeless

* The recipe for the basic bag now uses the forge:ender_pearls item tag instead of requiring the vanilla ender pearl specifically

* Added a client config option to disable the load/unload particle effects

* Players that have the ability to use the bag with creative override power now do so by holding the sprint key. If the sprint key is not held, the bag will be used at standard power. There is a client config option to invert this behavior (such that creative-power players always use the bag with full creative power, but can hold sprint to use it at standard power).