Move shard type loading to datapacks (#22)

* groundwork

* make it work

* fix server crash

* use stringifiedTranslatable when necessary

* move respacks to top-level

* comment out shard type saving in persistentstate

* new ShardType json schema, move codecs to camelcase, misc fixes

---------

Co-authored-by: Falkreon <[email protected]>

Author: acikek

bc23-shards/assets/bc23/lang/en_us.json

@@ -0,0 +1,6 @@
+{
+  "shard_type.bc23.visitor.description": "Visitor Shard",
+  "shard_type.bc23.challenge.description": "Challenge Shard",
+  "shard_type.bc23.secret.description": "Secret Shard",
+  "shard_type.bc23.missing.description": "Missing Shard"
+}