Make modules event based

[Anders Nissen <anissen@daimi.au.dk>]

This task is converting the game engine and module system to communicate purely by means of event. Instead of having the game engine maintaining collections of (tick dependent and tick independent) IModules, the game engine will maintain an event queue for initialization, deinitialization and processing. Each module has to be explicitly hooked to the engine by listening to the desired event queue(s).

Closely related to this is the state system, which in this approach is really just a hierarchical event interceptor. This is also part of this ticket.

[Anders Nissen]

Ticked closed - handled by the new event system.

[zerny]

Lets keep the ticket open until we have actually implemented the above. The event system is in place, but we need to create event interception objects and methods for controlling module execution times (for time dependent modules).

[zerny]

New event structures are now implemented with pach: New event based rendering structure and vertex array merged with main.

We still need the utility functions/macros to control module processing times.

[zerny]

This is now implemented in core and most extensions and projects are being updated to the new structure. The main patch is  API CHANGE - New event based engine.