Removed dead code

dwr_checkPageAction was replaced with webNavigation in 7451d66ff7ddb2a9f24f591fcf9aef2a2c946d93
Add link to Opera/ Chrome add-on listing in viewer
Add default auto-completion for common types
Updated LESS file
Add checkboxes to toggle visibility of files

Hide files via checkboxes based on generic type:
- Images
- Code
- Markup
- i18n (_locales folder)
- Misc (other)
Published to Chrome Web Store [v1.1.11]

New features:
- Filter by file type
- Show link to Chrome Web store / Opera add-on gallery for
  extensions originating from these locations.
- Removed RegExp filter examples from tooltip, placed RegExp in
  datalist for autocompletion (double-click on input box).