implement mixin picker with no options atm, and handle progressive deprecation for "mixins" key in widgets
Merge branch 'master' into mixins-with-options

Conflicts:
	var/www/canopsis/core/lib/loaders/mixins.js
push mixinselector
Merge branch 'master' into mixins-with-options

Conflicts:
	var/www/canopsis/core/lib/loaders/mixins.js
implement mixin forms
refactor pagination mixin to use dedicated schema and fix mixin form values assignations
start to implement configuration of mixins
refactor refresh from widget core to mixin (periodicrefresh)
add a check to prevent code using init method in view mixins
fix periodic refresh interval clearing when updating widget
make pagination mixin use 5 items per page by default, without displaying an error
fix mixinselector (changes were destroying mixins settings
refactor customfilters to make remove buttons works on firefox
Merge branch 'mixins-with-options' into new-schema-loader

Conflicts:
	var/www/canopsis/core/adapters/resource.js
	var/www/canopsis/core/mixins/responsivelist.js
	var/www/canopsis/uibase/components/classifieditemselector/template.html
	var/www/canopsis/uibase/templates/customfilters.html
	var/www/canopsis/uibase/templates/widgettitlebar.html