Container Rent & Updated GP

I've finally found some time to work on RealEstate so I've updated the modified GP jar, as well as quickly added in the ability to rent only the containers. Hopefully this quick update didn't introduce any new bugs, but don't hesitate to report any new one you find.

Thanks to @FabianGal45, there's a new config option to remove the decimals.

Don't forget to use both new jar files.