Issue 6180 - use ABP_TEXT everywhere in order to let String be a UTF-8 string

compiled/StringScanner.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 13 matching lines @@
 
 class StringScanner
 {
 private:
   const DependentString mStr;
   String::size_type mPos;
   String::size_type mEnd;
   String::value_type mTerminator;
 public:
   explicit StringScanner(const String& str, String::size_type pos = 0,
-        String::value_type terminator = u'\0')
+        String::value_type terminator = ABP_TEXT('\0'))
       : mStr(str), mPos(pos), mEnd(str.length()), mTerminator(terminator) {}
 
   bool done() const
   {
     return mPos >= mEnd;
   }
 
   String::size_type position() const
   {
     return mPos - 1;
@@ skipping 19 matching lines @@
 
   bool skip(String::value_type ch)
   {
     bool skipped = false;
     while ((skipped = skipOne(ch)));
     return skipped;
   }
 };
 
 ABP_NS_END