Steel's updated textures

- Added nuclear reactor, including valves and logic adaptors, control rods and control rod assemblies.

- Added reactor glass and refreshed the look of structural glass

- Added plutonium, polonium, fissile fuel and antimatter pellets

- Added chemical injection chamber

- Added fluorite crystal and dust

- Added teleportation core, portable teleporter, network and seismic readers

- Slight changes to uranium ingot, again. 

- Refreshed the look of all valves/ports on all machines

- Refreshed the look of energy tablets