randomize VST parameters

Some people may find this useless, but I would like to be able to randomize the parameters on VST effects/instruments. I find this can be very inspirational for coming up with fascinating sounds that I wouldn’t have found on my own.
I think I’m also lazy. :P

nah, randomize buttons are always fun. think of AXS or other softsynths. (orangator too, I think)

already done for 1.21