Better inventory export

Inventory export plugin that does more than the current invent_dump command of BakkesMod does.

Either use the F2 -> Plugins -> better inventory export buttons or call invent_dump_better csv|json to dump the current inventory to ./bakkesmod/data/inventory.{format}.

Additional data exported compared to the standard invent_dump command:

• Special edition type
• Blueprint item id: If the item is a blueprint, the ID of the item the blueprint item unlocks
• Blueprint item: Name of the item the blueprint unlocks
• Blueprint cost: Amount of credits needed to unlock the blueprint

Drawbacks:

• InstanceID is not available (always 0)