The Points class is kind of useless because you will always have to
convert things back into a FloatBuffer for use with OpenGLES.

So to clean things up a bit, getting rid ofthe whole LinkedList of Points
and will just add touches, along with any important meta data, to the
renderer.  The renderer can keep track of the touch history instead.

Right now, the only meta data being passed down is the MotionEvent action,
but this will likely include things like timestamps in the future.  Events
may get changed into a seperate class, but eitherway, it makes most sense
to keep the touch coordinates seperate.