Squashed commit of the following:
apps/examples/pwlines: The example is complete and verified.
apps/examples/pwlines: A little more progress between distractions.
apps/examples/pwlines: Beginning of another per-window framebuffer test/examples.
apps/examples/pwfb: Solve a race condition by changin some relative priorities. Also removes a delay kludge that used as a workaround.
apps/examples/pwfb: Add rate control. Examples becomes unstable at high update rates.
Squashed commit of the following:
apps/examples/pwfb: Fixes compile and early debug issues.
apps/examples/pwfb: Code complete!
apps/examples/pwfb: Flesh out the motion logic.
apps/examples/pwfb: Add an example/test case that will, eventually be used verify the per-window framebuffer logic. This is not even code complete at this point.