Made some modifications to spell customization.

You can now pick Area of Effect Modifiers to limit the cost and scope of your spells.  You can, for instance, limit the spell's effects to only creatures of a certain type in the area, to only targets on the ground, to only targets with a certain status effect, or similar things.  In addition, I added some complex new spell effects that offer a large degree of customization.  One effect lets you trigger another spell if a certain event happens during the first spell's duration and one lets you convert a particular status effect on a target into another spell effect.  So for example, you could could create a spell that converts the Bleeding status to a healing effect or one that converts the target's Force Barrier status into Gravity damage.