Major rework for WoD

I was wrong about this AddOn becoming irrelevant, because Blizzard
didn't make the obvious change of having GetComboPoints() return
something useful without a target or adding a combo point parameter to
the UNIT_COMBO_POINTS event. They did, however, fix the delay of combo
points gained from Primal Fury, so this AddOn is still less relevant
now.
Rename PrimalAnticipation.lua to core.lua
Reduce number of errors made when without a target
Change name and fix/improve some stuff
Tag as 1.0b1