Generate dynamic blocks from BlockDefinitions in CategoryFactory

We should move this to BlockCatalog at some point

Author: wnbaum

addons/block_code/block_code_plugin.gd

@@ -33,6 +33,7 @@ const DISABLED_CLASSES := [
 
 func _enter_tree():
 	Types.init_cast_graph()
+	CategoryFactory.init_block_definition_dictionary()
 
 	editor_inspector = EditorInterface.get_inspector()
 	editor_selection = EditorInterface.get_selection()