Named & reorderable priorities instead of "1", "2", "3", ...

- Players can create named priorities, for example "core power supply", "general power supply & refinery", "default", "compost dumping", "water district", ...
- Players can reorder priorities, priorities towards the top are prioritised for power & transport

Also i this seems to be very essential for optimizing power generation setups to waste less steam for turbine spinups.