Implement confirm dialog with three options
disable any other actions while confirm dialog is opened
Merge branch 'Reach' of https://github.com/pboyer/flood into clearing-home-ws
make the dialog work correctly on closing by X button, make it nicer and put in the center of the page
Merge pull request #98 from marimano/clearing-home-ws

REACH-142 On closing workspace with unsaved changes, should prompt user with three options