The APIs have access to the solid data, and I fixed a bug: Basically, the
template parameter for std::bitset expects an integer representing the
number of bits to hold, but I initially misread it as the number of bytes.
This has been corrected.
I've also added a sandy beach to the generated island. I'm tempted to
start working on some simple generators soon.
I've changed some naming concentions in the lua APIs. I've also made a few
other tweaks, like region_pager_api.cpp delegating to the passed
RegionPager object. This won't explicitly run, becuase there's still a few
more changes needed.