Since the last_power value used to show power output for a radiation
collector only updates during radiation pulses, pulling a radiation
collector away from the Singularity's area of effect and re-enabling it
caused it to show power it wasn't producing. This fixes that
- Change plasma tank prompt for unwrenching to span warning
- Some formatting
- When the plasma tank is pulled out, last_power is set to 0
- When the radiation collector is manually disabled, last_power is set
to 0
- As a failsafe, if the radiation collector is de-anchored, last_power
is set to 0