Harp Strings should ring out/sustain after they've been played

[cunningar0807]

As I was mentioning a while back, I think it would be appreciated if the harp strings in midijam should sustain/ring out, like what you would normally see on a real harp. The tubular Bells/Chimes in the program actually do that automatically, so why not the harp strings too?

[wyskoj]

I am implementing animations are they are seen in MIDIJam, so if MIDIJam doesn't do that, then it's likely I won't implement it.