Button and Icons - CSS and Demos

[jaspermdegroot]

• All: Replace "btn" by "button"
• Button: Review button CSS in core.css (compare with https://github.com/jquery/jquery-ui/blob/button/themes/base/button.css)
• Button: Merge and update Button and Button Markup demo pages
• Controlgroup: Update CSS
• Controlgroup: Update demo page
• Checkboxradio: Update CSS
• Checkboxradio: Update Checkbox and Radio buttons demo pages
• Icons: Change CSS to use spans instead of pseudo elements
• Icons: Update Icons demo page
• All: Update widgets that use icons to generate spans instead of adding icon class to the element + update the "Enhanced" examples on demo pages
  • Listview
  • Collapsible
  • Selectmenu
  • Navbar
  • Toolbar (back button)
  • Textinput (clear button and search icon)
• Demos: Add spans for icons and remove icon classes from anchor/button elements
  • Update custom CSS to spans instead of pseudo elements
  • Header search and menu buttons
  • API docs link buttons
  • h2widget / quick links
  • jqm-contents.php (pre-enhanced collapsibles)
  • Check global navmenu and search
  • Check all demo pages