Rethink x and z wheeling during y wheel scale

[axelpale]

If translation and scale are both enabled for wheel, the scaling becomes very hard on mac touch pad. The horizontal movement on touchpad is too easy to do accidentally.

What needs to be done:

• if only rotation is allowed, use deltaY
• if only scaling is allowed, use deltaY
• if only translation is allowed, use deltaX and deltaY
• if both translation and rotation are allowed, use deltaX and deltaY for translation and deltaZ for rotation.
• if both translation and scaling are allowed, use deltaX and deltaY for translation and deltaZ for scaling.
• if both scaling and rotation are allowed, use deltaY for scaling and deltaZ for rotation.
• if all are allowed, throw an error.