added new version of openproject-icon-font

- uses only unpronounceable unicode chars
- more icons
- adapted all icons to new unpronounceable unicode chars
Improved usage of icon font

- added data-icon css rules to the icon classes
- replaced all 'data-icon' occurrence with the css classes
Icons for the content area

- started to use the icon font in the content area
Use new delete icon

- removed old delete icon styles
- uses new icon font for delete icon
- whitespace fixes in app/views/projects/settings/_versions.html.erb
use new quote icon
use correct time icon in sidebar
icon for clear actions

- changed to icon from icon font
removed reload icon from old application.css
fixed white space in wp index
more icons from the icon font in the content
new version of icon font

includes more icons
added css rules for new icons

uses icon from icon font for more menu