New Touch protocol in place

For once, it took more time to flowchart this than it did to implement it, but I can now reliably detect click, longpress and double click. I've changed to double click for for pick up and drop. It seems to cause less finger trouble.

The next activity is definitely the prototype game. I've got all the elements I need in the engine now, I think. I just have to use these capabilities to write an acceptable mini game.

I've been a little disappointed by the appearance of some of my backgrounds on the Xoom. I'll experiment with less compressed jpg files.