Offense & Defense changes

Here's a pull to get people thinking about offense and defense. This nerfs
nobody, instead opting to empower personal enchantments and Forces
of Light with double the offense for spellpower-based components. I chose
these sources because they can be purged by spell or proc, or opponents
might not have the buffs up.

* Touch spells now get an extra offense bonus to help them match
weapons. This bonus scales with caster health, offering up to 300
offense when max health is attained.

* Kara'hol's Curse offense bonus based on spellpower doubled. Can now
offer up to 496 offense. Worth it for such a dangerous spell.

* Eagle Eyes offense for ranged weapons doubled, up to 198 based on
spellpower.

* Bless offense doubled, up to 198 based on spellpower.

* Forces of Light offense bonus based on spellpower doubled, up to 250
total.