### Summary
- Drastically streamlines the spell targeting by collapsing the target classes into a single `SpellTarget<T>` class.
- Moves TargetRange to the spell itself so it can be used by MageAI.
- Changes range check in MageAI to use TargetRange. This should fix target acquisition bugs
### Summary
- Cleans up target cancellation being called incorrectly.
- An invalid target type (which should never happen), now calls `OnTargetUntargetable` instead of `OnTargetCanceled`
- Removes double calls to `FinishSequence` in Spells.
* Fixes disarm
* Fixes strangle not refreshing
* Fixes curse not refreshing
* Fixes 125% bonus to looting rights
* Fixes mobs attacking each other, or not attacking each other
* Fixes items dropping to the floor
* Fixes protection spell
* Fixes cure sending wrong message
