Event system

[alphaonex86]

The event system allow programed event or triggered event, it's mostly destined to do the day/night cycle, but can be used into more complex event like day with rain, night with full moon, ...

• Check the event system is working
• Do the simple night effect when the server is on event night
• Check if the monster match the right event (some monster are night/day only)
• Do the particles effect, like snow/rain via unique timer (extra)
• Do light mecanism where window/light town provide light and glow at night (extra)