Add more dit+dah sounds to zen player

[jwalthour]

And make them configurable by dropdown.

• Tones (100ms dit)
• quick tones (50ms dit?)
• Chickadees
• Piano notes
• Spring peepers
• Crickets

[jwalthour]

Some of these sounds would be quite a bit more convincing if it didn't play precisely the same sample each time. It might be worth putting in a bunch of similar samples for each item.