refactoring PICrypt, add PIStreamPackerConfig, delete piclientserver_config

libs/main/io_utils/piethutilbase.h

@@ -57,6 +57,9 @@ public:
 	//! Returns crypt layer key
 	PIByteArray cryptKey() const;
 
+	//! \brief Returns addition size for crypted data.
+	static size_t cryptSizeAddition();
+
 protected:
 	/*! \brief Returns encrypted data if layer enabled,
 	 *  otherwise returns unchanged \"data\" */