CRT flicker effect

Flex effect for creating something similar to the glitch & flicker of an old CRT when switching on/off or changing channel- maybe i just remember CRTs to be more broken / dangerous than they actually were, but probably not ;p

When used as showEffect or hideEffect either on a popup or in a viewstack the components will glitch on/off screen either as a ropey old CRT or possibly hi-tech holographic display.

This is just a rough starting point to create GPU accelerated pixel bender transition effects for flex components, although currently just using the sample twirl effect shipped with pixel bender this could be used to create effects like the stretch/warp effect applications do on mac when minimized/maximized.

Note; most parameters are set randomly each time the effect starts so has little configurability besides duration, although very short durations (50-75ms) can produce far more subtle glitches, while longer durations (2000ms+) can look more abstract or maybe 'magical'.