Added camera orbit controls.

src/display/camera.h

@@ -65,4 +65,20 @@ void cameraPerspective(camera_t *camera,
  */
 void cameraOrtho(camera_t *camera,
   float left, float right, float bottom, float top, float camNear, float camFar
+);
+
+/**
+ * Update a camera to orbit around a point.
+ * 
+ * @param camera Camera to update
+ * @param distance Distance from the point
+ * @param yaw Yaw (Y axis) rotation.
+ * @param pitch Pitch (X/Z axis) rotation.
+ * @param targetX X point to orbit around.
+ * @param targetY Y point to orbit around.
+ * @param targetZ Z point to orbit around.
+ */
+void cameraOrbit(camera_t *camera,
+  float distance, float yaw, float pitch,
+  float targetX, float targetY, float targetZ
 );