add UiSlider and some fix

config/ui.json

@@ -66,6 +66,20 @@
             ]
           }
         ]
+      },
+      {
+        "type": "Slider",
+        "name": "musicVolumeSlider",
+        "x": 1140,
+        "y": 100,
+        "width": 10,
+        "height": 500,
+        "value": 0.5,
+        "orientation": "vertical",
+        "textures": {
+          "track": "./resources/musicVolumeBarTexture.png",
+          "knob": "./resources/musicVolumeBarButton.png"
+        }
       }
     ]
   }