use "manyCombo" field for "gender" field, restrict hairdressers to female/male, closes #894

also partially addresses #895 and https://github.com/openstreetmap/iD/issues/7427: for that iD should actually also show the "no" values allow explicitly marking the absense of certain options

interim/source_strings.yaml

@@ -2160,6 +2160,8 @@ en:
         placeholder: Unknown
         # 'terms: access,female,male,unisex'
         terms: '[translate with synonyms or related terms for ''Gender'', separated by commas]'
+      gender_simple:
+        # female=*, male=*
       generator/method:
         # generator:method=*
         label: Method