* Fixes#904, icons are saved at or below 128x128
* Fixes#403, crash occurs due to dialog on non-gui thread
* Fixes#232, icon hashes calculated and compared against
Chnage to one method to set MessageWidget text passing type as
parameter.
Only messages with questions requiring user input reamin using
MessageBox dialog.
Use signal/slots to set message in MessageWidget and hide message,
signal/slots only used when required.Maybe need to change all calls to
signals/slots in the future.
* Replace favicon fetching using Google with fetching from the root of the website
* Follow up to 3 http redirects for the favicon
* Add download favicon from Google as fallback
* Move code responsible for fetching the favicon from Google on its own function to reduce repetitiveness.
