Include weapon skill and affinity in EquipInventoryData's Print Inventory

[sovietspaceship]

I'll give it a go sometime, but I'm not sure if changing the output format might break things for someone.

(I've implemented importing it into my build planner for the next release, but it's not very useful yet since all weapons are imported uninfused with default skill.)

[inuNorii]

Neat idea! I didn't actually expect any interest in the Print Inventory script.