screensaver: add tray action to lock screen now #726
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Description
This PR adds a new tray action to the screensaver plugin. It locks the screen right away, while the break is still running.
This was requested in #724.
It changes the icon that locks the screen later:
The padlock icon will lock the screen right away, while the padlock+arrow icon will lock it at the end of the break.
This needs some technical changes too:
Plugins now have the ability to add multiple tray icons, as well as tray icons that are not "single use", meaning they stay around after being clicked.