* Renamed inter.c to inter.cpp and refactored it

* Converted inter_server.conf to inter_server.yml

* Updated the makefiles

* Refactored inter-server storage handling logic

* Fixed a bug with wrong maximum being displayed
When you took out an item of the storage it would always display the maximum amount of the normal storage.

* Fixed a bug with storages that are over maximum

Thanks to @Akkarinage, @Lemongrass3110 and @Jeybla