Issue 4125 - [emscripten] Convert filter classes to C++

compiled/api.h

+#ifndef ADBLOCK_PLUS_TOOLS_H
+#define ADBLOCK_PLUS_TOOLS_H
+
+#include <emscripten.h>
+
+#define FILTER_PROPERTY(type, name, getter, setter) \
+    private:\
+      type name;\
+    public:\
+      type getter() const\
+      {\
+        return name;\
+      }\
+      void setter(type value)\
+      {\
+        if (name != value)\
+        {\
+          type oldvalue = name;\
+          name = value;\
+          std::u16string action(u"filter." #name);\
+          FilterPtr filter = shared_from_this();\
+          EM_ASM_ARGS({\
+            var pointerToFilter = require("filterClasses").pointerToFilter;\
+            var filter = pointerToFilter($1);\
+            FilterNotifier.triggerListeners(getStringData($0), filter, $2, $3);\
+          }, &action, &filter, value, oldvalue);\
+        }\
+      }
+
+#endif