Method clear

depends/tinyxml/tinystr.h:178–186

	}

	void clear ()
	{
		//Lee:
		//The original was just too strange, though correct:
		//	TiXmlString().swap(*this);
		//Instead use the quit & re-init:
		quit();
		init(0,0);
	}

	/*	Function to reserve a big amount of data when we know we'll need it. Be aware that this
		function DOES NOT clear the content of the TiXmlString if any exists.