Added ability to draw the power usage levels.
UI tweak
Power is now part of representation.
Power levels are now calculated.
Can now switch back and forth between the various units to see their screens.
Can now activate (W) and deactive (Space) weapon.
External threats now have HP calculated.
Action will now display.
Can now action movement and shields are added to power usage.
Slight change to how threats are initialized.
Added level advancement.
The round is now displayed. Also, went back to displaying everything.
Weapons will now damage/destroy enemies
Implemented enemy movement.
Fixed bug where firing into empty space crashes game.
Printed a message when a new enemy appears
Fixed improper movements. Enemies now spawn randomly.
Fixed determining closest external threat. Fixed displaying multiple external threats.
Implemented threat damage and ship shields.