Added ship details and tech stuff

Added a bunch of numbers to give each ship type a special "purpose".
Numbers can be changed later.  Starting fuel is now set to 0 for all
ships, must by ship & fuel.  Buying new ship transfers over all possible
fuel, sells excess.  Transfers over as much cargo / gadgets / weapons
ect. as possible, adding code to sell excess later.  Station is now a
rectangle, not a button, shows on system and planet view levels.  Add
one extra HIGHTECH planet per system to require at least one per system,
and High tech planets are more fun!