[New Feature] Driving the display module at a high clock rate should show persistance of vision effect

[sr14978]

[AliShug]

If this is going to happen then it might as well be packaged up with a much-needed rendering overhaul. Rendering should be split into:

• Static - the background and grid, module shapes, labels, and links
• Dynamic - LEDs and other display components

The static portion only needs to be drawn when the view changes. The dynamic portion should be drawn at the end of each simulation step, up to some limit (probably 20-30Hz, might as well be adjustable). Persistence of vision can then be simulated by tracking some 'luminance' value for individual LEDs for those simulation steps that occur between dynamic render passes.

This would all be vastly more efficient than the current system, which redraws the entire view at 30Hz regardless of simulation state.