Tasks:

• add fa to our codebase
• implement in at least 1 widget

Questions:
Where should we implement an icon to test the integration?
Do we need to replace the down and up arrows on ComboBox and TitlePane or keep as text content?
Should we use as few icons as possible or use in as many places as possible for a consistent look and feel?
We could always add 'type' to Dialog e.g. error|warn|info and have nice icons by the dialog content header..