Template out V8 and prepare for other JS engine implementations

src/FileSystemJsObject.cpp

 /*
  * 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 111 matching lines @@
 
             auto jsValues = jsEngine->TakeJsValues(weakCallback);
             if (!error.empty())
             {
               jsValues[1].Call(jsEngine->NewValue(error));
               return;
             }
 
             auto processFunc = jsValues[0].UnwrapValue().As<v8::Function>();
 
-            auto globalContext = context.GetV8Context()->Global();
+            auto globalContext = context.GetJSEngineContext()->Global();
             if (!globalContext->IsObject())
               throw std::runtime_error("`this` pointer has to be an object");
 
             const v8::TryCatch tryCatch;
 
             const auto contentEnd = content.cend();
             auto stringBegin = SkipEndOfLine(content.begin(), contentEnd);
             do
             {
               auto stringEnd = AdvanceToEndOfLine(stringBegin, contentEnd);
@@ skipping 165 matching lines @@
 JsValue& FileSystemJsObject::Setup(JsEngine& jsEngine, JsValue& obj)
 {
   obj.SetProperty("read", jsEngine.NewCallback(::ReadCallback));
   obj.SetProperty("readFromFile", jsEngine.NewCallback(::ReadFromFileCallback));
   obj.SetProperty("write", jsEngine.NewCallback(::WriteCallback));
   obj.SetProperty("move", jsEngine.NewCallback(::MoveCallback));
   obj.SetProperty("remove", jsEngine.NewCallback(::RemoveCallback));
   obj.SetProperty("stat", jsEngine.NewCallback(::StatCallback));
   return obj;
 }