Added fb & WaldEnd hooks

string.js

@@ -46,6 +46,7 @@ module.exports = {
 		var ctx = {
 			"exitCurrentTag": exitCurrentTag
 			, "stack": tokenStack
+			, "fd": ( x ) => ( tokenStack.empty() ? _fd_strOut : tokenStack.curr().fd )( x )
 		};
 
 		for( let i = 0; i < l; i ++ )
@@ -162,6 +163,8 @@ module.exports = {
 			}
 		}
 
+		_fineHandlers.WalkEnd && _fineHandlers.WalkEnd( ctx );
+
 		return strOut;
 	}
 }