add redstone tweaks resource pack and fix blockstate variant order

public/assets/minecraft/models/block/observer/on.json

@@ -0,0 +1,10 @@
+{
+    "parent": "block/observer/off",
+    "textures": {
+        "bottom": "block/observer/back_on",
+        "side": "block/observer/side_on",
+        "top": "block/observer/top_on",
+        "front": "block/observer/front_on",
+        "particle": "block/observer/front_on"
+    }
+}