Removes all use of floating point from the RaMapGenerator map generator
and its dependencies.
Floating point behavior is potentially non-portable across client
hardware. Removing them should make the map generation logic
consistent even across clients with different floating point hardware
or compiler behavior. This may be useful for sync-safe multiplayer map
generation where clients independently generate the map from settings.
Most previously fractional public-facing settings are now represented
as numbers out of 1000, with some exceptions using 1000000. Most
internal logic which relies on fixed-point concepts now uses 1024ths,
though some floating point mechanisms have been replaced with
alternative discrete approximations (e.g. gaussian to binomial).
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