change HarnessPlugin trait to add run_state to the step trait method

src_testbed/harness/mod.rs

@@ -166,7 +166,7 @@ impl Harness {
             .update(&self.physics.bodies, &self.physics.colliders);
 
         for plugin in &mut self.plugins {
-            plugin.step(&mut self.physics)
+            plugin.step(&mut self.physics, &self.state)
         }
 
         for f in &mut self.callbacks {

src_testbed/harness/plugin.rs

@@ -10,6 +10,6 @@ pub trait HarnessPlugin {
         harness_state: &RunState,
         t: f32,
     );
-    fn step(&mut self, physics: &mut PhysicsState);
+    fn step(&mut self, physics: &mut PhysicsState, run_state: &RunState);
     fn profiling_string(&self) -> String;
 }