ENYO-3375: Add 2 buttons to expand or collapse all categories of the designer's palette
ENYO-3375: reset Palette's filter before expanding or collapsing Palette's categories
ENYO-3375: switch "expand/collapse all"  buttons disabling status according to the Palette's categories buttons status
ENYO-3375: simply code and remove debug code
ENYO-3375: remove i18n strings
Merge pull request #703 from enyojs/ENYO-3375-HP

ENYO-3375: Add 2 buttons to expand or collapse all categories of the designer's palette