Inventory Slot Upgrade

Adds an upgrade to R.E.P.O that grants additional inventory slots.

Current behavior

• Configurable price from 100,000 to 1,000,000 in configs, either in-game or file.
• Each boxes adds one slot, up to 10 total slots.
• Optional Allow Team Upgrades config makes each activation grant slots to every player.
• Extra slots use keys 4, 5, 6, 7, 8, 9, and 0.
• Upgrade levels are saved and synchronized through REPOLib.
• Every player must install the mod and REPOLib for multiplayer.

Development

1. Copy Directory.Repo.props.example to Directory.Repo.props and fill in the local paths.
2. Run dotnet build -c Release.
3. The local package is written to dist/InventorySlotUpgrade/.

Do not run this together with MoreInventorySlots or BagExpander; those mods patch the same inventory UI and slot limits.