split real out into its own crate

this is a move toward reusing some of the coremem helper types in the
spirv backend.

crates/coremem/src/lib.rs

@@ -11,7 +11,6 @@ pub mod driver;
 pub mod geom;
 pub mod mat;
 pub mod meas;
-pub mod real;
 pub mod render;
 pub mod sim;
 pub mod stim;
@@ -20,6 +19,7 @@ pub mod util;
 pub use driver::*;
 pub use mat::*;
 pub use sim::*;
+pub use coremem_types::real;
 
 // Some things to keep in mind:
 // B = mu_r*H + M