Add config for US counties + some script changes

scripts/mapshaper/states.json

@@ -1,5 +1,5 @@
 {
-    "name": "Straits",
+    "name": "States",
     "directory": "/media/naturals/States/",
     "shapefile": "E:/macrovision/mapshaper/states/ne_10m_admin_1_states_provinces_lakes.shp",
     "mode": "forms",

scripts/mapshaper/us-counties.json

@@ -0,0 +1,11 @@
+{
+    "name": "US Counties",
+    "directory": "/media/naturals/US Counties/",
+    "shapefile": "E:/macrovision/mapshaper/us-counties/cb_2018_us_county_500k.shp",
+    "mode": "forms",
+    "base-filter": "true",
+    "name-key": "NAME",
+    "form-key": "STATEFP",
+    "stroke-width": 1,
+    "simplify-size": 100
+}