prepare for color scheme import/export chamges

this includes a small refactor of the settings mechanism

src/engine/configEngine.cpp

@@ -167,4 +167,8 @@ void DivEngine::setConf(String key, String value) {
 
 bool DivEngine::hasConf(String key) {
   return conf.has(key);
-}
+}
+
+DivConfig& DivEngine::getConfObject() {
+  return conf;
+}