Rename Resolution module

[LinusDierheimer]

The Resolution module does much more than just showing the resolution, for example the refresh rate or the brightness. I propose to use a better name, for example

• Display
• Monitor
• Screen

Personally i am leaning towards Display.

Your opinion @CarterLi?

[CarterLi]

Display is ok for me

[CarterLi]

Brightness is now a separate module, because brightness maps to physical display, while resolution maps to virtual display. For example, if you set an external display to a copy of the internal display, there will be one virtual display and one resolution, but there are still two physical displays so there are still two brightness values

[CarterLi]

Done in f4a5803