this should make cmake-pascal stuff work on linux too

fix ancient issue with hedgehogs sliding through/into think gaps; fixes issue #542; could and should be optimized (also to make sure that hogs can't slide through little pixel turds) - feel free to do so =P

with lot of hackery, use add_executable on pascal files, SUCCSS

More flagging of Land values. Also use less than for tests of non-terrain, instead of "and $FF00 = 0". Saves a couple of ops, which actually matters a small amount in a few places.

barebone cmake config file to support pascal files, based off plplot's ada files

add one button to improve sharing of hwplay:// schemes