Item14767: implement a proper icon service

• don't hard-code fontawesome
• allow to add more icon fonts and render them using %JQICON, e.g. material icons from WebFontsContrib
• make icons searchable: required for the icon formfield type of MoreFormfieldsPlugin

Note that I need to release a new JQueryPlugin early including these features as this will block other releases, e.g. MoreFormfieldsPlugin and NatSkin.

-- MichaelDaum - 11 Oct 2018

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