Revert pointer events change for OrbitControls and TrackballControls.

[Mugen87]

Fixed #20191.
Fixed #20193.
Fixed #20205.

[arodic]

I just want to note that this pointerEvents upgrade also broke all controls when using stylus (event.pointerType === 'pen')

switch ( event.pointerType ) {
   case 'mouse':
       onMouseMove( event );
       break;
}

I completely and overwhelmingly support transition to pointerEvents. It is an amazing API that will solve most of the unnecessary conditionals when dealing with different input devices and it will make the controls much simpler. It enables developers to write code that works with any pointer device, including the future ones.

In my experience, switch ( event.pointerType ) is unnecessary for most use cases - it defeats the purpose of using pointerEvents. You can treat pointer events as input-device-agnostic API. The only special case in my experience is pointer "hover" that cannot be achieved on traditional touch device. If you need a special hover behavior, this too can be achieved without dealing with pointerType.

In other words, switching to pointerEvents is great, but it should be done without dealing with pointerType unless really necessary - which is almost never.

[Mugen87]

@mrdoob Since you want to keep the Pointer Events change, I'll close this PR.

[WestLangley]

webgl_multiple_scenes_comparison.html slider is broken.

I think a hot patch to r.120 is appropriate.

[WestLangley]

It does not appear the hot patch fixed the slider example...

[Mugen87]

Still working on a solution: #20223

[WestLangley]

Oh, I see. You didn't revert the recent changes to the controls. That would have made it a trivial hot patch...

[mrdoob]

webgl_multiple_scenes_comparison.html slider is broken.

Should be fixed now.