Add var for number of seconds between data refreshes. Rename locals file to config and also end example files in .dart.

lib/var/config.EXAMPLE.dart

@@ -0,0 +1,5 @@
+// This file needs renamed `local.dart` when implemented.
+
+// Project-wide configuration variables for both testing and production.
+const bool debug = false;
+const int limitRefreshSeconds = 60;