Can only use one Gloss clock at a time #330
Description
The way the gloss clocks are implemented is such that only one 'GlossSimClockIO' can receive a time step. (Same for 'GlossEventClockIO'.) It would be nice if one could use several such clocks, especially for events. This could be implemented using a 'TChan' in principle, but would need 'FreeAsyncT' to be generalised.