Pin the torsional and rolling friction coefficients in the material (schema 5)

The coefficients are genesis-world 1.4.4's defaults, 0.005 m torsional and 0.0001 m rolling, so every scene keeps its physics and a later genesis-world default cannot change it.

rigid_sim.json

@@ -1,5 +1,5 @@
 {
-  "schema_version": 4,
+  "schema_version": 5,
   "genesis_world_version": "1.4.4",
   "precision": "32",
   "sim_options": {
@@ -41,6 +41,8 @@
   },
   "material": {
     "rho": 200.0,
-    "friction": 1.0
+    "friction": 1.0,
+    "friction_torsional": 0.005,
+    "friction_rolling": 0.0001
   }
 }