enable clear_graphics and run_callbacks agin

update plugin signature to recieve bevy structs, add Arc<Mutex<>> around gfx_components, we we can get shared mutable access
add prefab_meshes() access function

Remove Arc<Mutex<>>

src_testbed/plugin.rs

@@ -1,12 +1,32 @@
-use crate::harness::RunState;
+use crate::harness::Harness;
 use crate::physics::PhysicsState;
+use crate::GraphicsManager;
+use bevy::prelude::{Assets, Commands, Mesh, Query, StandardMaterial, Transform};
 use na::Point3;
 
 pub trait TestbedPlugin {
-    fn init_graphics(&mut self, gen_color: &mut dyn FnMut() -> Point3<f32>);
-    fn clear_graphics(&mut self);
-    fn run_callbacks(&mut self, physics: &mut PhysicsState, run_state: &RunState);
+    fn init_graphics(
+        &mut self,
+        graphics: &mut GraphicsManager,
+        commands: &mut Commands,
+        meshes: &mut Assets<Mesh>,
+        materials: &mut Assets<StandardMaterial>,
+        components: &mut Query<(&mut Transform,)>,
+        harness: &mut Harness,
+
+        gen_color: &mut dyn FnMut() -> Point3<f32>,
+    );
+    fn clear_graphics(&mut self, graphics: &mut GraphicsManager, commands: &mut Commands);
+    fn run_callbacks(&mut self, harness: &mut Harness);
     fn step(&mut self, physics: &mut PhysicsState);
-    fn draw(&mut self);
+    fn draw(
+        &mut self,
+        graphics: &mut GraphicsManager,
+        commands: &mut Commands,
+        meshes: &mut Assets<Mesh>,
+        materials: &mut Assets<StandardMaterial>,
+        components: &mut Query<(&mut Transform,)>,
+        harness: &mut Harness,
+    );
     fn profiling_string(&self) -> String;
 }