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_helper/Helper.cpp

@@ -900,3 +900,33 @@ const char* get404(void) {
 "                You could try your <a href=index.html target=_parent>luck</a> here!</pre>\n"
 "<script>document.cookie = \"page=overview.html\"</script>"; // Make sure we load the overview page
 }
+
+
+std::string UrlDecode(const std::string& value)
+{
+    std::string result;
+    result.reserve(value.size());
+
+    for (std::size_t i = 0; i < value.size(); ++i)
+    {
+        auto ch = value[i];
+
+        if (ch == '%' && (i + 2) < value.size())
+        {
+            auto hex = value.substr(i + 1, 2);
+            auto dec = static_cast<char>(std::strtol(hex.c_str(), nullptr, 16));
+            result.push_back(dec);
+            i += 2;
+        }
+        else if (ch == '+')
+        {
+            result.push_back(' ');
+        }
+        else
+        {
+            result.push_back(ch);
+        }
+    }
+
+    return result;
+}