RUST updates, other

- TEGs and binary circulators can now be secured, rotated and moved around. 
- TEGs and binary circulators can be ordered from the cargo bay. 
- Circuit research level tweaks to make them more accessable
- Fixed a bunch of construction and useability issues for compressors, ports, computers (some critical)
- Fixed power issues with core control, computers, injectors
- Fixed icon issues with computers
- Fixed some mapping issues with rust_test.dmm

This should resolve all outstanding issues except for: 
- Turbines not being buildable (they're an optional secondary power system though)
- Various balance, useability and stability issues which I'll address later. 

Other changes: 
- Changed roundstart music according to poll on the forum
- Removed double announcement for grid checks. 
- Readded missing supply packs (#2484)
- Added "back" button to cargo bay computer menus, to speed up ordering en masse