Bump GreaseMonkey version number

GreaseMonkey now works the same (or even better) as with QtWebKit.
The only difference is that GM_setClipboard is not implemented
and GM_value functions are saving only to localStorage.

src/plugins/GreaseMonkey/gm_plugin.cpp

@@ -41,7 +41,7 @@ PluginSpec GM_Plugin::pluginSpec()
     spec.name = "GreaseMonkey";
     spec.info = "Userscripts for QupZilla";
     spec.description = "Provides support for userscripts (www.userscripts.org)";
-    spec.version = "0.5.2";
+    spec.version = "0.6.0";
     spec.author = "David Rosca <nowrep@gmail.com>";
     spec.icon = QPixmap(":gm/data/icon.png");
     spec.hasSettings = true;

src/plugins/GreaseMonkey/gm_script.cpp

@@ -281,14 +281,6 @@ void GM_Script::parseScript()
     const QString script = fileData.mid(index).trimmed();
     m_valid = !script.isEmpty();
 
-#if QTWEBENGINE_DISABLED
-    QString jscript("(function(){"
-                    "function GM_getValue(name,val){return GM_getValueImpl('%1',name,val);}"
-                    "function GM_setValue(name,val){return GM_setValueImpl('%1',name,val);}"
-                    "function GM_deleteValue(name){return GM_deleteValueImpl('%1',name);}"
-                    "function GM_listValues(){return GM_listValuesImpl('%1');}"
-                    "\n%2\n})();");
-#endif
     const QString nspace = QCryptographicHash::hash(fullName().toUtf8(), QCryptographicHash::Md4).toHex();
     const QString gmValues = m_manager->valuesScript().arg(nspace);