preparations for v15.0 (#2063)

* Migrated parameters, see https://github.com/jomjol/AI-on-the-edge-device/pull/2023

* remove no longer used "topic" parameter. This is a backport from b21e3c6c9d

* Fix wrong url-encoding, see https://github.com/jomjol/AI-on-the-edge-device/issues/2036 resp. https://github.com/jomjol/AI-on-the-edge-device/issues/2036

* Threashold -> Threshold

* updated changelog

---------

Co-authored-by: CaCO3 <caco@ruinelli.ch>

code/components/jomjol_flowcontroll/ClassFlowMQTT.h

@@ -19,7 +19,7 @@ protected:
     std::string OldValue;
 	ClassFlowPostProcessing* flowpostprocessing;  
     std::string user, password; 
-    int SetRetainFlag;
+    bool SetRetainFlag;
     int keepAlive; // Seconds
     float roundInterval; // Minutes
 
@@ -32,7 +32,7 @@ public:
     ClassFlowMQTT(std::vector<ClassFlow*>* lfc, ClassFlow *_prev);
 
     string GetMQTTMainTopic();
-    bool Start(float AutoIntervall);
+    bool Start(float AutoInterval);
 
     bool ReadParameter(FILE* pfile, string& aktparamgraph);
     bool doFlow(string time);