1.5 Demos: various issues

WIP branch: 1.5-demos-issues (base branch: 1.5-dev)

Preview: http://view.jquerymobile.com/1.5-demos-issues/demos/

Update: If you want to help with updating/fixing the demos for version 1.5, please let us know in a comment on this ticket so we can prevent that multiple people work on the same thing. Thanks!

• Main menu: duplicates (most widgets)
• Main menu: Icons section shouldn't be under Theming section
• Main menu: update markup to new accordion widget
• Main menu: 3rd level is missing indent
• Main menu: double border when 2nd level is a collapsible (expand "Widgets" to see the issue)
• Main menu: should other jQuery UI widgets should also get "3rd party" banner just like Datepicker?
• Menu appears twice in C-grade: initially hide the search autocomplete menu content with CSS and reveal with JS (see #7679)
• Icons in header (search and menu) shouldn't get shadow
• Update CSS/markup of quick links and API docs links
• Cleanup/update demos custom CSS
• Better hover style for navmenu, quick links (table of contents) menu, and search panel list
• Check if new custom styles have enough contrast on SD/Windows
• New homepage design and content
• Replace the outdated image on the homepage (and on jquerymobile.com)
• 3rd Party: Add a banner or some other notification on the demo page itself (+ warning not supported)
• Search panel is empty
• Search panel and page filterable reveal issue
• Search panel doesn't submit on enter, only after tab followed by enter
• Search panel arrow key navigation is broken
• Search panel list is empty on the search results (_search/index.php) page: probably conflict in the JS
• View source popup contains collapsibles: change to accordion or tabs (if tabs work inside popups)
• Quick links: jumps to section and then back to top (This is not a Demos specific issue, but a general issue with panels. See #8323 #6767. PR https://github.com/jquery/jquery-mobile/pull/8483 fixes this)
• Quick links: If you open a popup (e.g. a view source popup) after you have clicked on a link in the quick links panel or a "back to top" link, the page scrolls back to that deeplink location or top when closing the popup. This is because the url changes from something like #ui-page-top&ui-state=dialog to #ui-page-top.
• Controlgroup: Textinput demo needs to be rewritten (maybe better to make this a separate demo)
• Duplicate files in https://github.com/jquery/jquery-mobile/tree/1.5-dev/demos/toolbar-fixed-persistent-optimized
• View Source: single quotes are converted to double quotes
• Replace Slider widget by Flipswitch widget flip switches (http://view.jquerymobile.com/1.5-dev/demos/listview/#Forms, http://view.jquerymobile.com/1.5-dev/demos/forms/#Flipswitch)
• Add data-direction="vertical" to controlgroups that are supposed to be vertical
• Revert popup close button class change: ui-toolbar-header-button-right|left --> ui-button-right|left (or ui-popup-button-right|left + add class name to popup.css and deprecate ui-button-right|left)
• Headers: Add button classes to anchor elements in headers on demo pages that don't have the global header
• Rewrite Button and Icons demo pages (see first comment below)
• Test + check markup and content all demo pages
• Test with a build (manipulation of links on homepage, API docs links, version, etc.)
• Move Form widgets to Widgets section in navmenu
• Add intro paragraphs to mention that custom CSS or JS is used (e.g. http://view.jquerymobile.com/1.5-demos-issues/demos/flipswitch/#Basiccheckboxswitchwithcustomlabels)
• Highlighting of matching strings in search panel list is broken
• Remove references to iconshadow. See #8492 (closed as duplicate)