Nice to have: updatable liquid levels.

[pmich]

In the debug menu, when I hit the 'test dispensers' button, I expect to see the most up to date liquid levels in the console, but neither 'test dispensers' nor 'refresh' work like I expect them to, they don't give updated liquid level values. Since getting that info is liquid level specific anyway, I would think it belongs in that tab. I want a way to view current levels without saving them. In an ideal world, this is what I would want: