feat: vendor dialogue manager v3

addons/dialogue_manager/dialogue_processor.gd

@@ -0,0 +1,11 @@
+class_name DMDialogueProcessor extends RefCounted
+
+
+## Override to modify the incoming raw string.
+func _preprocess_line(raw_line: String) -> String:
+	return raw_line
+
+
+## Override to modify the outgoing dialogue line.
+func _process_line(line: DMCompiledLine) -> void:
+	pass