Allow getting entity pool from entity context
Allow getting screen coords of entities
allow stowing user data in entities
label ships on 3d nav view
use generic icon models on 3d nav screen
fix some formatting crap
draw axes on 3d nav view rings
show targeting rings on main screen
make science zoom smoothly
change color of 3d button on nav screen
allow button labels to be changed
change 3d nav button depending on mode
get rid of unnecessary else clause
draw targeting ring on 3d nav screen