rename 'coremem_types' -> 'coremem_cross' to better reflect its purpose

crates/coremem/src/meas.rs

@@ -1,6 +1,6 @@
 use crate::geom::{Meters, Region, Torus, WorldRegion};
 use crate::real::{Real as _, ToFloat as _};
-use crate::types::vec::Vec3;
+use crate::cross::vec::Vec3;
 use crate::sim::SampleableSim;
 use dyn_clone::{self, DynClone};
 use indexmap::IndexMap;