made changes back for old engine
Restored event receivers for the power station.
PowerStation has now 4 sliders instead of one.

These don't work yet do hold your horses
- Together with Rik Ruiten
Limit scrollbars to powerpool percentage.

Together with Rik Ruiten
PowerStation only displays Helm and Weapon

- Naviagation and Defence are commented out
- Together with Rik Ruiten