a failed login removes username and password

   https://github.com/MutonUfoAI/pgina/issues/2
logincheck if pGina service is running

https://github.com/MutonUfoAI/pgina/issues/1
bugfix show Message during login

https://github.com/MutonUfoAI/pgina/issues/7
dont display loginUI until the pgina service is running
clean username and password during a service dis-connect event
update version to 3.1.6.1
show attention pictogram as bitmap if the service is unavailable