Remove hour/day/minute listeners in favor of a big update function

[joskuijpers]

Give ssMain a big update function that calls into our modules, allowing us to control update order perfectly.

So WM:dayChanged turns into :updateForecast and :updateWeatherListeners. After that, the germination data in GM is updated, instead of WM calling into GM.

There should be a "before midnight" and "after midnight".

[joskuijpers]

Btw, this is only for mod classes. Objects and Specs can of course use the listeners freely.