Revamp idle options

[RoydZeller]

I had problems with screensavers and found #374

Now, I can disable power management to use xset again, but then lid watcher stops working.

The issue here is that LXQT interferes with other screen lockers, but it can't do everything on it's own:

• You can't blank after 5 minutes, and lock after an additional 5 minutes, suspend after another 5 minutes.
• The options are limited to maximum 1 hour.

Before I could have xset s/xss-lock handle screen blanking and locking and have lxqt do the suspend (though still unideal due to time limit). Now I actually have to drop using lxqt power management entirely and add a whole another thing to handle it's work.