v2.1.0

• completely rewrite the icon detection logic
• provide 2 seperate implementations
  • editable --> will replace the placeholder within the editable with the correct mapped icons
  • spannable --> will build up a new Spannable with the mapped icons
• automatically recheck new text on textViews and buttons for iconics icons
• move out icon detection logic into the IconicsUtils
• remove short methods again because they are not necessary anymore
• change style methods to public to allow greater control
• make automatic activity text a bit more complex to check more edge cases of the icon detection
• remove update of the textView as this is now done automatically
• add 2 more methods which will call the style methods (remove all non common params on them)
• remove obsolete static on the Icon enum of the Octicons