Make salvage and repair directly available from inventory

Right now, many players just take the salvage and repair station with them, so this wouldn't have a radical effect on balance, as it only saves one inventory spot and having to put down/pick up the salvage station. This solves the common issue of inventory getting clogged with non-stackable drops and doesn't force players to interrupt exploration as often when they need to unload inventory.

- The Salvage function would be an inventory icon that enters "salvage mode" changing the cursor icon (similar to the "lock" feature) and salvages any item clicked until disabled.
- The repair function would be a hammer icon, and function exactly the same as it does in the current salvage and repair station.

This makes the salvage and repair station largely obsolete. So the station itself could be removed from the game.