Change saveString() to saveArrayBuffer() for STL binary exporter.

Make sure that any objects being removed from the scene are also detached from the transformControls before the next render pass.

Fixes #10916, #9312, #5489 and #5379

Fixed rotation at negative scale.

Merged TransformControls into one file and updated examples.

Added rotation snapping in local and world mode.

Cleaning up transform controls math and variables.