at least if we expose flatbuffers in our api. otherwise others can't use it

tired of recomputing all this crap

…et for a friday

We're going to use luajit ffi instead.

<redacts swear words>

wait until we know how to implement it

Lots of conflicts; build fixes upcoming

had to remove nested lists in geometry because
flatbuffers don't support them

because we sometimes need both the old and new
state, so they can't share memory