Add a character controller implementation

src/control/mod.rs

@@ -0,0 +1,8 @@
+//! Utilities for controlling the trajectories of objects in a non-physical way.
+
+pub use self::character_controller::{
+    CharacterAutostep, CharacterCollision, CharacterLength, EffectiveCharacterMovement,
+    KinematicCharacterController,
+};
+
+mod character_controller;