buildings-start_date: equals some common tagging mistakes

- 1910-1911 -> 1910..1911
- 191* -> 1910s

buildings-start_date.json

@@ -26,6 +26,11 @@
             "{% if not start_date and attribute(tags, 'building:year') %}{% set start_date = attribute(tags, 'building:year') %}{% endif %}",
             "",
             "{% if start_date %}",
+            "  {# equalize tagging mistakes - need to add QA messages #}",
+            "  {# convert 1910-1911 to 1910..1911 #}{% set m = start_date|matches('^(\\d{4})-(\\d{4})$') %}{% if m %}{% set start_date = m[1] ~ '..' ~ m[2] %}{% endif %}",
+            "  {# convert 191* to 1910s #}{% set m = start_date|matches('^(\\d{3})\\*$') %}{% if m %}{% set start_date = m[1] ~ '0s' %}{% endif %}",
+            "",
+            "",
             "  {% set value = start_date|osmParseDate %}",
             "  {% if value and value[0] and value[1] %}",
             "    {% set value = (value[1] - value[0]) / 2 + value[0] %}",