Pagecontainer: make all page events go through triggerWithDeprecated

To make sure all former page events have a page container counterpart,
and that this counterpart has both a toPage and prevPage prop on the ui
object
Also add a demo of how to debug pagecontainer events

Fixes gh-7063
Fixes gh-7283
Fixes gh-7176
Closes gh-7285
Selectmenu: Update demo to no longer rely on deprecated page events

Re https://github.com/jquery/jquery-mobile/pull/7285#issuecomment-43017058