QtIFW

Enable links and text selection in component description fields

External links can now be included in component description by specifying
a proper URL address like this: {external-link}='https://www.qt.io/'.
The link fields can be placed anywhere inside package <Description> tags.

Task-number: QTIFW-1292
Change-Id: I1d916a58224bdfb6e885445873bf541fad3cf834
Reviewed-by: Tarja Sundqvist <tarja.sundqvist@qt.io>
Reviewed-by: Katja Marttila <katja.marttila@qt.io>