[fontdrasil] Typed coordinate spaces

This started out as just an experiment, but I ended up fleshing it out
to the point where it is mergeable, if we wish.

The basic motivation was seeing the duplication in methods defined on
the various `Coords`, and wanting to unify that.

fontbe/src/glyphs.rs

@@ -6,7 +6,7 @@
 use std::collections::{BTreeSet, HashMap, HashSet};
 
 use fontdrasil::{
-    coords::{Location, NormalizedCoord, NormalizedLocation},
+    coords::NormalizedLocation,
     orchestration::{Access, AccessBuilder, Work},
     types::GlyphName,
 };
@@ -247,7 +247,7 @@ fn compute_deltas(
     glyph_name: &GlyphName,
     var_model: &VariationModel,
     should_iup: bool,
-    point_seqs: &HashMap<Location<NormalizedCoord>, Vec<Point>>,
+    point_seqs: &HashMap<NormalizedLocation, Vec<Point>>,
     coords: &Vec<Point>,
     contour_ends: &Vec<usize>,
 ) -> Result<Deltas, Error> {