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

compiled/ActiveFilter.h

 #pragma once
 
 #include <emscripten.h>
 
 #include "Filter.h"
 #include "StringMap.h"
 
 #define FILTER_PROPERTY(type, name, getter, setter) \
     private:\
       type name;\
     public:\
       type EMSCRIPTEN_KEEPALIVE getter() const\
       {\
         return name;\
       }\
       void EMSCRIPTEN_KEEPALIVE setter(type value)\
       {\
         if (name != value)\
         {\
           type oldvalue = name;\
           name = value;\
           DependentString action(u"filter."_str #name);\
           EM_ASM_ARGS({\
             var filter = new (exports[Filter_mapping[$2]])($1);\
-            FilterNotifier.triggerListeners(getStringData($0), filter, $3, $4);\
-          }, &action, this, GetType(), value, oldvalue);\
+            FilterNotifier.triggerListeners(readString($0), filter, $3, $4);\
+          }, &action, this, mType, value, oldvalue);\
         }\
       }
 
 class ActiveFilter : public Filter
 {
 protected:
   typedef StringMap<bool> DomainMap;
   typedef StringSet SitekeySet;
   void ParseDomains(const String& domains, String::value_type separator) const;
   void AddSitekey(const String& sitekey) const;
   virtual DomainMap* GetDomains() const;
   virtual SitekeySet* GetSitekeys() const;
   mutable std::unique_ptr<DomainMap> mDomains;
   mutable std::unique_ptr<SitekeySet> mSitekeys;
 private:
   bool mIgnoreTrailingDot;
 public:
-  ActiveFilter(const String& text, bool ignoreTrailingDot);
+  explicit ActiveFilter(Type type, const String& text, bool ignoreTrailingDot);
   FILTER_PROPERTY(bool, mDisabled, GetDisabled, SetDisabled);
   FILTER_PROPERTY(unsigned int, mHitCount, GetHitCount, SetHitCount);
   FILTER_PROPERTY(unsigned int, mLastHit, GetLastHit, SetLastHit);
-  static void ToLower(DependentString&& str);
   bool EMSCRIPTEN_KEEPALIVE IsActiveOnDomain(DependentString& docDomain,
       const String& sitekey) const;
   bool EMSCRIPTEN_KEEPALIVE IsActiveOnlyOnDomain(DependentString& docDomain) const;
   bool EMSCRIPTEN_KEEPALIVE IsGeneric() const;
   OwnedString EMSCRIPTEN_KEEPALIVE Serialize() const;
 };