Turret chassis naming

[glenmack]

There are currently two items named "turret chassis", one from dismantled military deploy-able turrets and one required for installing turrets into vehicles. Suggest changing non vehicle one to "turret interior chassis" as the description reads "What's left when you remove all moving parts and electronics. It's the skeleton and armor of a turret." And amend second part of the description to just be "It's the skeleton of a turret."