FLUID-4949: Added icon fonts. Added font styles to UIOptions.css. Started to add icons to the headers of the UIO panels.
FLUID-4949: Added missing line spacing font, text style, and simplify. Changed the text colours.
NO-JIRA: merging changes from the demo branch.
FLUID-4949: Added icons for text-to-speech and simplify.
Merge branch 'demo' into FLUID-4949
FLUID-4949, FLUID-4938: Removed unused font SVG files. Tweaked the text used in the emphasize links and buttons panel.
Merge remote-tracking branch 'jhung/FLUID-4949' into demo

* jhung/FLUID-4949:
  FLUID-4949, FLUID-4938: Removed unused font SVG files. Tweaked the text used in the emphasize links and buttons panel.
  FLUID-4949: Added icons for text-to-speech and simplify.
  FLUID-4949: Added missing line spacing font, text style, and simplify. Changed the text colours.
  FLUID-4949: Added icon fonts. Added font styles to UIOptions.css. Started to add icons to the headers of the UIO panels.