refs https://github.com/TryGhost/Team/issues/803
With multiple products we'll re-enable segmentation by product for posts, which also means need to add a new option to the default post access setting in Membership settings. This change -
- adds new `A segment` option to default post access dropdown behind the alpha flag for multiple products
- shows member segment select dropdown for `A segment` option
- handles update of `defaultContentVisibility` to allow setting custom filter
no issue
- add icon + icon color to the subscription access and default post access option lists
- updated templates to use icon in trigger and option display
- fixed ember-power-select styles overriding svgs in trigger
no issue
- provides clearer indication of current setting without having to expand anything
- has more minimal UI which helps when settings screen has multiple areas
no issue
- the membership setting screen will be covering a lot of areas, having individual settings as discrete components allows for easier re-organisation and cleaner parent templates and controllers
