Refactor official Nuki MQTT support. Move offical-specific code into sepereate class. (#470)

* move offical related members to seperate class

* remove static references

* add buildMqttPath and comparePrefixedPath methods to NukiOfficial

* make offMqttPath private

* fix references and syntax errors

* move nuki official publish state update check to NukiNetworkLock

* make _disableNonJSON private

* make NukiOfficial members private

* move _offCommand to NukiWrapper

* make offCommandExecutedTs private

* make offTopics privte

* fix nuki publisher reference not set

* use NukiPublisher in NukiNetworkOpener

* fix build updater

* fix pl_off and stat_off strings

src/NukiNetworkOpener.h

@@ -76,9 +76,10 @@ private:
 
     String concat(String a, String b);
 
-    Preferences* _preferences;
+    Preferences* _preferences = nullptr;
 
     NukiNetwork* _network = nullptr;
+    NukiPublisher* _nukiPublisher = nullptr;
 
     std::map<uint32_t, String> _authEntries;
     char _mqttPath[181] = {0};