Battery swap [WIP]

Aim is to implement a WRENCHABLE flag that means a part can be installed/removed with only a wrench. For example, to install and remove a battery without requiring use of a welder, or duct tape.
- [x] Add wrenchable flag
- [x] add wrenchable flag to small storage battery
- [x] enable removal of wrenchable part with wrench
- [ ] fix ui relating to removal
- [x] enable install of wrenchable part with wrench
- [ ] fix ui relating to install
- [ ] test properly