Add a Remember me check button - Login page

[akylbekesenaliev]

I think we need to add a Remeber me check button since users might re-use laucnhers to install some more components, lets say user did not install Tray on his first attempt then he decides to install it and now user needs to re-open launcher and re-login again, this might be a bit inconvienient for users, also why dont we make it easier for users and give them ability to stay logged in if they want - this way they wont have to re-login everytime.