Parse all issues inside a page, and load them into the issues overlay.
In group A, given issues inside later sections are hidden, it will not be possible
to navigate to these new overlay screens. In group A, lead section issues will continue
to only show lead section issues.
Changes:
* The /issues route is replaced by the more specific /issues/all and
/issues/{section num}, issues are stored in an "allIssues" module object.
* Begin using constants for namespaces for better readability
* Drop width 100% - this breaks display on tablet devices of issues within
sections
* Improve createBanner documentation to explain different treatments
* Set the issues overlay header inside initPageIssues when setting up
the route.
Bug: T197932
Change-Id: I21470648a61d57cfa4befceec596cf0f6e2110ec
596e405807