webui: extract header and action logic from facet to separate mixins

Into:
* ActionMixin
* HeaderMixin

It is supposed to be used as a mixin classes to facet.Facets. In long
term it should replace/serve as a base class for facet.facet.

e.g:
var SomeFacet = declare([Facet, ActionMixin, HeaderMixin], {
	foo: function() {}
});

Then following spec can be used:

some_facet_spec = {
    name: 'some',
    label: 'Some Facet',
    tab_label: 'Some Facet',
    facet_groups: [foo.bar_facet_group],
    facet_group: 'search',
    actions: ['refresh'],
    control_buttons: [
        {
            name: 'refresh',
            label: '@i18n:buttons.refresh',
            icon: 'fa-refresh'
        }
    ],
	header_actions: [refresh]
};

reg.facet.register({
    type: 'some',
    ctor: SomeFacet,
    spec: some_facet_spec
});

prerequisite for: https://fedorahosted.org/freeipa/ticket/4286

Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

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