Infested: Swarms and Spiders

Minor cleanup and tweaks.

• If a Mantis' attack target dies while it has the ambush effect, it will exit the ambush early.
• Mantises will now regain health when killing any creature, not just arthropods.
• Tamed Mantises will no longer take damage from their owners attacks while they are ambushing (and therefore invisible, making it hard for them to be seen.)
• Tamed Mantises will have their health increased to 40 when they are tamed, like tamed wolves.
• Tamed Spiders that have been given an Alchemy Spider skin can now be given a regular spider egg to clear the skin.
• Minion mobs can no longer push their owner, meaning cases where they might push you around if you have many present, or they might push you off a block should no longer happen.