Toggle for wrapping longer lines in 'code' blocks.

- If browser supports `localStorage` on `file://` protocol at the bottom of the page check-box will appear, which enables/disables line wrapping.
- Tested on recent versions of desktop browsers: Opera, Firefox Google Chrome and Chromium - everything works, settings are shared across all Gradle reports.
  - However IE (even the newest versions) even if it supports `localStorage` it does not work with `file://` protocol.
    - So feature will not work on IE right now, but it is completely unobtrusive - it checks the ability to read / write `localStorage` and do not detect the browser vendor/name.
    - If in future any browser (IE or any other untested by me) will enable API compliant with `localStorage` and it will work properly with `file://` protocol, feature will work automatically on such environment.
- If user will clean browser cache, this setting will be purged as well.
- Visually check-box is not distinctive from the footer, but is a part of it.