Merge pull request #239 from jb-aero/master

Implemented ArmorStands & Prepared for Vector upgrades.

Thanks jb-aero!
Add player_interact_at_entity for Armor Stands
Clarified player_interact_at_entity event docs
Fixed EventException messages
Get position once.
Merge pull request #240 from PseudoKnight/master

Add player_interact_at_entity for Armor Stands