Code cleanups (#696)

* apply const in wrapper classes

* move NukiWrapper methods into Util class

* move NukiOpenerWrapper methods into Util class

* rename Util classes to Helper

* apply const to nuki network classes

clion/CMakeLists.txt

@@ -58,7 +58,8 @@ set(SRCFILES
         ../src/enums/NukiPinState.h
         ../src/networkDevices/Tlk110Definitions.h
         ../src/SerialReader.cpp
-)
+        ../src/util/NukiHelper.cpp
+        ../src/util/NukiOpenerHelper.cpp
 
 file(GLOB_RECURSE SRCFILESREC
         lib/NimBLE-Arduino/src/*.c