Move state kept in OvaleState into the relevant modules.

Move state kept in OvaleState into the relevant modules.

Each module now manages part of the state for the simulator.  A module
needs to define the following (possibly empty) methods:

    ResetState(state)
    ApplySpellStart(state, ...)
    ApplySpellToPlayer(state, ...)
    ApplySpellToTarget(state, ...)

The module also needs to define a state prototype with additional methods
that should be mixed into the state object maintained by OvaleState.

Modules register/unregister their state for the simulator using:

    OvaleState:RegisterState(...)
    OvaleState:UnregisterState(...)

This de-couples OvaleState from every module that tracks some piece of
information in the game.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1149 d5049fe3-3747-40f7-a4b5-f36d6801af5f