Introduce new spell priority feature ``wait=N''.

Introduce new spell priority feature ``wait=N''.

Setting wait=N in a Spell() or Item() action will cause that action to
have priority over later actions if the later actions start within N
seconds of that action's start time.

In the following example, Crusader Strike will be suggested over later
actions as long as it is within 0.2 seconds of the Crusader Strike
cooldown, otherwise Judgment will be suggested within 0.2 seconds of the
Judgment cooldown, followed by Templars Verdict or Holy Prism using normal
start time comparisons.

    Spell(crusader_strike wait=0.2)
    Spell(judgment wait=0.2)
    Spell(templars_verdict)
    Spell(holy_prism)

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1015 d5049fe3-3747-40f7-a4b5-f36d6801af5f