(refacto) add a zone context to store zone's informations

[hebus]

• add a zone's context service to store zone's informations needed by the child elements
• remove useless @input property
• remove transform animations when hovering editable zone (when editor is on)
• css class input is now a textarea element
• layout's configurator refacto (same as spacing and borders)
• using ng-template is now not mandatory to set an uib-template element
• when customizing element's css, no margin/padding relative to uib-builder are applyed