Replace ActionSelectionPopover with an ActionItem selection popover

[Tim Peeters]

ActionSelectionPopover uses delegates to represent actions passed to the component, just like the old Toolbar did. This creates problems in customizing its contents, and in accessing the objects in autopilot tests.

I propose we create a new popover that makes use of ActionItems (for example ListItem.Standard, which can use an Action as input) instead of the Action directly. This way, the developer can control the representation of the action easily and the objects can be given an objectName to access them directly from autopilot tests.

Note that the solution will be similar to current Dialogs. Check the designs of the apps first to make sure a Dialog is not the desired component to use.

[Nicholas Skaggs (nskaggs)]

I'll just add comments hear about apps that use this and how they use it.

Terminal. Button on toolbar launches popover to select several different options. They display/hide UI elements

File Manager. Uses it when long pressing on a file or folder for an "action" menu of things to perform on your selected object

RSS Reader. Button on toolbar. Actions listed upon pressing button. Lets you launch to several different pages