Add support for the expired status

SOAPUI-1806 improved-oauth-2-access-token-statuses
Add support for overriding the browserClosed() event handler

 This to be able to get a notification when the browser windows has been closed

SOAPUI-1806 improved-oauth-2-access-token-statuses
Set the Get access token button text to (Resume) if the OAuth flow is in progress
Add a Retrieval canceled state
Make the Entered manually state a little less positive
Add real icons

This to tell the user that the previous access token transaction didn't complete

SOAPUI-1806 improved-oauth-2-access-token-statuses
Refactor the due to changes from next
Don't show the status label for Entered manually besides the Get access token input field
Show the lock icon for all statuses besides Expired