### Summary
- Fixes various memory leaks related to spells
- Fixes Spell Plague
- Added ability to determine if `sdi` should take effect for Spell Damage.
- Fixes animal form timer ticking non-stop while logged out.
* 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
- [X] Caches DateTime.NowUtc on the game loop (not other threads)
- [X] Replaces all locations where it makes sense
- [X] Adds Min/Max for `IComparable` (TimeSpan, DateTimes, etc)
Closes#261
