Ask for a reason when a ticket changes status

Some status changes need context. Why is this blocked? Why was it abandoned? You can now ask for it.

• Turn it on per status. In project settings, under Statuses, switch on Require comment for any status. It's off by default.
• A quick prompt. Moving a ticket into that status, whether by dragging it on the board or changing it on the ticket, asks for a short explanation first.
• Saved as a comment. The explanation is posted on the ticket, so the reason is there for everyone to see.

Also in this release:

• Show your password while typing it on the login page, with a toggle that works from the keyboard too.
• No more duplicate comments. A double-click or a flaky connection could post the same comment twice. Each comment is now only ever posted once.