Refactor conversation stuff

cutscene/item/ItemAction.gd

@@ -0,0 +1,16 @@
+class_name ItemAction
+const ConversationAction = preload("res://cutscene/conversation/ConversationAction.gd")
+
+static func itemGetCallable(params:Dictionary) -> int:
+  assert(params.has('stack'))
+  PARTY.BACKPACK.addStack(params['stack'])
+  params['cutscene'].addCallable(ConversationAction.getTextboxCallable('TEST').merged({
+    'position': Cutscene.CUTSCENE_ADD_NEXT,
+  }))
+  return Cutscene.CUTSCENE_CONTINUE
+
+static func getItemCallable(itemStack:ItemStack) -> Dictionary:
+  return {
+    "function": itemGetCallable,
+    "stack": itemStack
+  }