Teach OvaleCooldown about spell charges.

Teach OvaleCooldown about spell charges.

Lazily update the cooldown information of spells based on the age of the
cooldown state, which is flagged to be updated when a spell's charges or
cooldowns is changed or if a spell is successfully cast.

Add a GetSpellCharges() method to the state machine to act like the
Blizzard API function of the same name.

Fixes ticket 357.

Age cooldown state properly.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1419 d5049fe3-3747-40f7-a4b5-f36d6801af5f