There's sound... kina

Hey all,

I don't think anyone actually reads these... but that's okay.  It gives me a chance to keep track of what I'm thinking - which is usually, not a lot.

So I cannibalised code from another quick project to add in a little sound for the ball.  It's derpy sound, but I'm no sound engineer.  Besides, I can always come back to it later to improve it.

The repulsors are in there and working, and they are becoming the cornerstone of the next few levels before I start combining them towards levels 9 and 10 with the Attractors.  You have been warned. Level 10 (which I made out of sequence) is bit tough...

Expect a new build early December.