Add copy to clipboard button.

[DWiechert]

It would be nice to have a "Copy To Clipboard" button to copy the code instead of typing it manually.

[ecki]

I have made it so that it is automatically selected, so you only need to use keyboard shortcut to copy it to clipboard (you type the password, hit enter and with the hand still on keyboard you type ctrl+c).

But yes having an extra button would be better for discoverability. Thanks for the idea ... do you want to give it a try it is very small/simple/stupid swing code.

[DWiechert]

Ya, I can take a look at submitting a PR for this change.