Share code for data path retrieval in engine and plugin

src/plugin/PluginSettings.h

Index: src/plugin/PluginSettings.h
===================================================================
--- a/src/plugin/PluginSettings.h
+++ b/src/plugin/PluginSettings.h
@@ -72,19 +72,16 @@ private:
 
   CPluginSettings::TProperties m_properties;
 
   bool m_isDirty;
 
   CString m_settingsVersion;
   std::auto_ptr<CPluginIniFileW> m_settingsFile;
 
-  static WCHAR* s_dataPath;
-  static WCHAR* s_dataPathParent;
-
 
   static CComAutoCriticalSection s_criticalSectionLocal;
 #ifdef SUPPORT_WHITELIST
   static CComAutoCriticalSection s_criticalSectionDomainHistory;
 #endif
 
   bool m_isPluginSelftestEnabled;
 
@@ -100,17 +97,16 @@ public:
 
   static bool s_isLightOnly;
   static bool HasInstance();
   static CPluginSettings* GetInstance();
 
   bool Read(bool bDebug=true);
   bool Write(bool bDebug=true);
 
-  static CString GetDataPathParent();
   static CString GetDataPath(const CString& filename=L"");
 
   static CString GetTempPath(const CString& filename=L"");
   static CString GetTempFile(const CString& prefix, const CString& extension=L"");
 
   bool Has(const CString& key) const;
   void Remove(const CString& key);