High CPU usage

[wchill]

Because the plugin manager busy waits for a new frame to be ready, CPU usage is pegged at 100% on one core.

This might be fixed by having plugins specify the amount of time before they will be ready to display another frame.

[wchill]

Alternative solution: install a callback function that is called when plugin is ready to display a new frame.

[modi95]

Going ahead with the callback approach.