Now possible to change whether "Send" or "Drop" appears in the unit's item menu

It is now possible to change whether "Send" or "Drop" appears in the unit's item menu.

When I added the feature to send a unit's possessions to storage, I completely replaced the "Drop" command, the purpose of which was to prevent accidents like "I meant to send the item, but it got thrown away". But some people didn't like losing a feature that was originally there, so I made it possible to toggle it in the options.

However, this took away one of the benefits to change the class to Transporter. Well, it's kind of weird that being able to drop items from storage is a benefit, so it should be thought that things are back to how they should be.