+Working random terrain type

Added routine to select a random terrain type for a planet.
Fixed name issue, added list of planets

Turns out the naming and planet type wasn't working, and had an
unecessary " - 1" which was preventing the last item in  the "name list"
and "planet type list" from being used.

In addition, planets are now being stored in the PLANETLIST LIST, which
allows for  planets to easily be browsed, sorted and etc.