Touchlib updates

I checked in a few changes that really speeded up the existing apps - OSC.exe is now down to about 12% cpu on my machine (from 25-30%). Smoke was also down from 75% to 50%. Most of the slowdown with touchlib was due to multithreading issues (blocking and waiting). I think there still may be some improvements to be had by changing the way we acquire images. Right now the touchlib processing thread blocks until it aquires an image. If we could have it surrender execution until an image is available, it would be mean that the cpu is tied up for less time.