Added functions and methods to support the pickup radius. Functionality includes:
Corrected serialization for ControllablePhysicsComponent which correctly serializes the pickup radius to the client.
A method to add the pickup radius to the list of active pickup radii the component has.
A method to remove and re-calculate the largest active radii the component currently has.
Tested equipping all variations of the LootBuff behavior (passive skills, items, item skills) and all functioned as intended. Tested equipping multiple items with a loot buff and then unequipping them in different orders. Tested adding pickup radii of different values and the server correctly adjusted the pickup radius to the largest one currently equipped.
