fix and add some functions

bbp_ng/UTIL_blender_mesh.py

@@ -0,0 +1,27 @@
+import bpy, bmesh
+
+## Blender Mesh Usage
+#  This module create a universal mesh visitor, including MeshReader, MeshWriter and MeshUVModifier
+#  for every other possible module using.
+#  Obviously, MeshReader is served for 2 exporter, MeshWriter is served for 2 importer.
+#  MeshWriter also served for BMERevenge module and Ballance element loading.
+#  MeshUVModifier is used by Flatten UV and Rail UV.
+#  
+
+class MeshReader():
+    pass
+
+
+class MeshWriter():
+    pass
+
+
+class MeshUVModifier():
+    pass
+
+
+def register() -> None:
+    pass # nothing to register
+
+def unregister() -> None:
+    pass