clean up island validation type, seems to work. needs edge-fill so that
the underlying platform is not so square
cleanups to layout
fix clearAction for island and underwater types
verify water validation type works
fix up sky validator type -- works
fix up underground validator...probably the easiest of all
most validators working. need a bit more work on leveling/smoothing
stuff, and a few minor quirks to sort out in the 'island' and 'water'
types