Keyboard Media Keys

[AstraLuma]

Add something for the following keys:

• [x] Mute
• [x] Volume Down
• [x] Volume Up
• [ ] ThinkVantage (XF86Launch1)
• [x] Lock
• [ ] Battery
• [x] Sleep
• [x] Wireless (maybe to bluetooth? Since there's a physical switch, too
• [ ] Display selection
• [ ] Touch pad selection (probably don't want to change it, but don't know what to do with it
• [x] Computer eject
• [x] Hibernate
• [x] Brighter
• [x] Darker
• [x] Play/Pause
• [x] Stop
• [x] Next
• [x] Previous