Newstroke: Add readable glyphs to character names

This means you don't have to keep referring to a Unicode
table to know which character is where - you can see it in the
list and use the symbol search system.

No change to generated output (such suffixes are stripped by the
fontconv.py script).

tools/newstroke/fontconv.py

@@ -223,7 +223,11 @@ class Glyph(NamedTuple):
     def from_sexpr(cls, sexp: Any) -> 'Glyph':
         if sexp[0] != "symbol":
             raise KicadSymError(f"Expected a symbol sexpr: {sexp}")
-        name = sexp[1]
+
+        # If the name ends with a double underscore suffix, it's a suffix with the
+        # codepoint of the glyph as a readable glyph, and we don't need it here.
+        name = re.sub(r"__.*$", "", sexp[1])
+
         if name[0] in Compositions.transforms:
             raise KicadSymError(f"Invalid glyph name {name}")