feat: migrate to glam whenever relevant + migrate testbed to kiss3d instead of bevy + release v0.32.0 (#909)

* feat: migrate to glam whenever relevant + migrate testbed to kiss3d instead of bevy

* chore: update changelog

* Fix warnings and tests

* Release v0.32.0

examples2d/stress_tests/balls2.rs

@@ -0,0 +1,63 @@
+use rapier_testbed2d::Testbed;
+use rapier2d::prelude::*;
+
+pub fn init_world(testbed: &mut Testbed) {
+    /*
+     * World
+     */
+    let mut bodies = RigidBodySet::new();
+    let mut colliders = ColliderSet::new();
+    let impulse_joints = ImpulseJointSet::new();
+    let multibody_joints = MultibodyJointSet::new();
+
+    /*
+     * Ground
+     */
+    let _ground_size = 25.0;
+
+    /*
+    let ground_shape = ShapeHandle::new(Cuboid::new(Vector2::new(ground_size, 1.0)));
+
+    let ground_handle = bodies.insert(Ground::new());
+    let co = ColliderDesc::new(ground_shape)
+        .translation(-Vector2::y())
+        .build(BodyPartHandle(ground_handle, 0));
+    colliders.insert_with_parent(co);
+    */
+
+    /*
+     * Create the balls
+     */
+    let num = 50;
+    let rad = 1.0;
+
+    let shiftx = rad * 2.5;
+    let shifty = rad * 2.0;
+    let centerx = shiftx * (num as f32) / 2.0;
+    let centery = shifty / 2.0;
+
+    for i in 0..num {
+        for j in 0usize..num * 5 {
+            let x = i as f32 * shiftx - centerx;
+            let y = j as f32 * shifty + centery;
+
+            let status = if j == 0 {
+                RigidBodyType::Fixed
+            } else {
+                RigidBodyType::Dynamic
+            };
+
+            // Build the rigid body.
+            let rigid_body = RigidBodyBuilder::new(status).translation(Vec2::new(x, y));
+            let handle = bodies.insert(rigid_body);
+            let collider = ColliderBuilder::ball(rad);
+            colliders.insert_with_parent(collider, handle, &mut bodies);
+        }
+    }
+
+    /*
+     * Set up the testbed.
+     */
+    testbed.set_world(bodies, colliders, impulse_joints, multibody_joints);
+    testbed.look_at(Vec2::new(0.0, 2.5), 5.0);
+}