Move m_sHomePath from CZNC to CFile

Thanks to this change, linking the following object files produces no unresolved
symbols: FileUtils.o Utils.o ZNCString.o MD5.o SHA256.o

The idea here is that ZNC is a little better modularized.

Signed-off-by: Uli Schlachter <psychon@znc.in>

FileUtils.h

@@ -120,6 +120,9 @@ public:
 	CString GetShortName() const;
 	CString GetDir() const;
 
+	static void InitHomePath(const CString& sFallback);
+	static const CString& GetHomePath() { return m_sHomePath; }
+
 private:
 	// fcntl() locking wrapper
 	bool Lock(int iType, bool bBlocking);
@@ -127,6 +130,8 @@ private:
 	CString m_sBuffer;
 	int     m_iFD;
 
+	static CString m_sHomePath;
+
 protected:
 	CString m_sLongName;  //!< Absolute filename (m_sPath + "/" + m_sShortName)
 	CString m_sShortName; //!< Filename alone, without path