[feat] promote experience about floor creation.

- change bl_options and rewrite invoke and draw functions to let floor creating window become more visual. credit: BLumia.
- also change 3ds max align and flatten uv presentation after changing creating floor window.
- seperate icon loader/unload module.

ballance_blender_plugin/UTILS_constants.py

@@ -290,11 +290,6 @@ for walk_root, walk_dirs, walk_files in os.walk(os.path.join(os.path.dirname(__f
                 floor_derivedBlockList.append(item["Type"])
                 floor_blockDict[item["Type"]] = item
 
-icons_floor = None
-icons_floorDict = {}
-# blenderIcon_elements = None
-# blenderIcon_elements_dict = {}
-
 rename_normalComponentsGroupName = set([
     "P_Extra_Life",
     "P_Extra_Point",