ENYO-3082-cleanup: Cleanup and renames to prepare work on bug fix


This PR is focused on adding comments and renaming kinds, files and 
whatnot to make the designer easier to understand. No other
change was done in this PR.

* ENYO-3082: renamed Ares.App kind in Ares.DesignerFrame
* ENYO-3082: renamed iframe into designerFrame...
* ENYO-3082: renamed css classe iframe-* in designer-frame-*
* ENYO-3082: renamed iframe in designerFrame
* ENYO-3082: renamed IFrameDesigner in Designer
* ENYO-3082: renamed Model into ProjectKindsModel (within js files)
* ENYO-3082: renamed Model.js in ProjectKindsModel.js
* ENYO-3082: added some comments
* ENYO-3082: added traces
* ENYO-3082: forgot to update package.js when renaming DesignerPanels to DevelopmentPanel
* ENYO-3082: rename DesignerPanels to DevelopmentPanel
* ENYO-3082: use errorPopup handled by Ares itself
* ENYO-3082: fire projectSelected event after project is setup
* ENYO-3082: replaced event catched by owner with direct calls to owner...
* ENYO-3082: more traces
* ENYO-3082: replaced try/catch with cautious tests before action
* ENYO-3082: function parameter order now match the order of the serializer structure
* ENYO-3082: added comment

Related JIRA: https://enyojs.atlassian.net/browse/ENYO-3082

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