Make Fleets list their ship counts

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Display more detailed ship counts in GalacticObject screen

Signed-off-by: James Tasker <james_tasker1@hotmail.com>
Allow user to create multiple empty fleets

Signed-off-by: James Tasker <james_tasker1@hotmail.com>