hacky fix to non-ascii design names

src/ttboard/project_mux.py

@@ -98,7 +98,20 @@ def deserialize_int(cls, bytestream, num_bytes):
     def serialize_string(cls, s:str):
         slen = len(s)
         bts = slen.to_bytes(cls.BytesForStringLen, cls.ByteOrder)
-        bts += bytearray(s, cls.StringEncoding)
+
+        try:
+            enc = bytearray(s, cls.StringEncoding)
+        except:
+            news = ''
+            for i in range(len(s)):
+                c = s[i]
+                if ord(c) < ord('A') or ord(c) > ord('z'):
+                    news += '_'
+                else:
+                    news += c
+            enc = bytearray(news, cls.StringEncoding)
+
+        bts += enc
         return bts
 
     @classmethod 
@@ -644,4 +657,4 @@ def __str__(self):
     def __repr__(self):
         des_idx = self.projects
         return f'<ProjectMux for {self.run} with {len(des_idx)} projects>'
-
+