Resolve "Add parameter type "array""

Closes #28 (closed)

lib/parameters/models/settings/settings_activity.dart

@@ -26,6 +26,10 @@ class ActivitySettings {
 
   String get(String code) {
     if (values.keys.contains(code)) {
+      if (appConfig.getFromCode(code).allowMultipleValues) {
+        return getAsArray(code).join(',');
+      }
+
       if (appConfig.getFromCode(code).allowedValues.contains(values[code])) {
         return values[code] ?? appConfig.getFromCode(code).defaultValue;
       }
@@ -54,6 +58,19 @@ class ActivitySettings {
     }
   }
 
+  List<String> getAsArray(String code) {
+    final List<String> legitValues = [];
+    if (values[code] != null) {
+      values[code]?.split(',').forEach((candidateValue) {
+        if (appConfig.getFromCode(code).allowedValues.contains(candidateValue)) {
+          legitValues.add(candidateValue);
+        }
+      });
+    }
+
+    return legitValues;
+  }
+
   void dump() {
     printlog('$ActivitySettings:');
     values.forEach((code, value) {