New motor settings UI proposal

[wenwei-dev]

• Be able to select multiple motors or motor groups
  Because it's often needed to adjust multiple motors at the same time. For example, you may want to adjust the values for both left and right eye brows.

• Be able to revert to original values
  Sometimes people just want to undo the settings. We should keep at lease the original values so you can always to back to that.

• Be able to specify exactly the values
  The current bar UI is great for intuitive tuning. But it can't set a specified value to a motor, which is desired sometimes.

[vytasrgl]

How do you imagine adjusting values for more than one motor at same time?
Currently values are reset if dialog is closed, but reset button might be ok to have,