Vampires Add-on

Small bug fixes.

• The Count can now  summon hostile Vampire Bats as an attack. They act like vexes, but have larger hitboxes, less health and cant move through walls.
• Vampire thralls will no longer attack you if you are a Vampire.
• Small entity refactors. This shouldnt have any effect on gameplay.

The above changes are part of a little code refactor for future additions.