Add rate threshold parameter (#3195)

* still needs to be tested

https://github.com/jomjol/AI-on-the-edge-device/issues/3143

* Update ClassFlowPostProcessing.cpp

code formatting

* Update ClassFlowDefineTypes.h

code formatting

* Update ClassFlowPostProcessing.h

code formatting

* Update edit_config_template.html

* fix

* Update config.ini

* Update edit_config_template.html

* Updated param doc

* Rename parameters

* Update edit_config_template.html

* Update NUMBER.ChangeRateThreshold.md

* Update NUMBER.ChangeRateThreshold.md

---------

Co-authored-by: CaCO3 <caco3@ruinelli.ch>

param-docs/parameter-pages/PostProcessing/NUMBER.ChangeRateThreshold.md

@@ -0,0 +1,25 @@
+# Parameter `<NUMBER>.ChangeRateThreshold`
+Default Value: `2`
+
+Range: `1` .. `9`.
+
+Threshold parameter for change rate detection.<br>
+This parameter is intended to compensate for small reading fluctuations that occur when the meter does not change its value for a long time (e.g. at night) or slightly turns backwards. This can eg. happen on watermeters.
+
+It is only applied to the last digit of the read value (See example below).
+If the read value is within PreValue +/- Threshold, no further calculation is carried out and the Value/Prevalue remains at the old value.
+
+Example:
+
+    Smallest ROI provides value for 0.000x
+    ChangeRateThreshold = 2
+  
+    Extended Resolution disabled:
+    PreValue: 123.456'7 >>> Threshold = +/- 0.000'2
+	Comparative value >>> max = 123.456'9 and min = 123.456'5
+	
+    Extended Resolution enabled:
+    PreValue: 123.456'78 >>> Threshold = +/- 0.000'02
+	Comparative value >>> max = 123.456'80 and min = 123.456'76
+
+![](img/ChangeRateThreshold.png)