Adding standard UI sounds

[emily-phet]

@jbphet @zepumph
Please also add the standard UI sounds to the radio buttons, the reset all button, and the pickup/drop of the freely moving objects, as well as the screen selection buttons.

Note - the tolerance slider is just to support design, it will not be in a final version of the sim, so don't add sound to that slider.

[zepumph]

@jbphet and I turned on build in UI sounds yesterday. We can add the pickup/drop sound next.

[jbphet]

@zepumph and I worked on this together today and the sounds are now all in place with the exception of the grab/release sounds for the second screen, which @zepumph said he'll take care of. Unassigning.

[zepumph]

KeyboardDragListener fires start/end for each arrow key interaction. This made grab/release sounds feel really weird, so I moved them instead to be based on focus/blur events. This sounds much nicer. I also added these to the bar screen. This issue is ready for review.

[zepumph]

From design meeting, let's take out the pickup and drop sounds from the bar screen.