ENYO-3677: added required next() to fix/undo/redo


* ENYO-3677: handle mandatory next callbacks 
* ENYO-3677: ENYO-3629: lang.js added assertCb and noNext function
* ENYO-3677: ENYO-3629: reindented for ENYO-3311

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-3677

Enyo-DCO-1.1-Signed-off-by: Dominique Dumont <dominique.dumont@hp.com>