ENYO-3831: new designer toolbar

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-3831

* Regroup some designer-toolbar items together within FittableColumns to manage them as an unique blocks.
* Add screen orientation
* Enhanced the screen sizing customization

Enyo-DCO-1.1-Signed-off-by: Vincent HERILIER vincent.herilier@hp.com