Init ships so they get systems
Don't eat the throttle value
Replace individual power messages with one

Just send the system ID in the message there is no need to send the
endpoint. The server knows what ship every endpoint is on since the
networking system already assigns them a unique peer ID. Each ship
contains it's own crew so they can never do anything other then set the
ship they are in/on.
Send new system update messages
Show desired system power and send input
Set desired values for items that are system linked
Enable desired values on system sliders