Add support for media keys

dots/pnmixer/config

@@ -0,0 +1,31 @@
+[PNMixer]
+SliderOrientation=vertical
+DisplayTextVolume=true
+TextVolumePosition=0
+ScrollStep=5
+FineScrollStep=1
+MiddleClickAction=0
+CustomCommand=
+VolMuteKey=121
+VolUpKey=123
+VolDownKey=122
+AlsaCard=(default)
+NormalizeVolume=true
+SystemTheme=true
+DrawVolMeter=false
+VolMeterPos=0
+VolMeterColor=0.90980392156900003;0.43137254902;0.43137254902;
+VolumeControlCommand=
+EnableHotKeys=true
+VolMuteMods=0
+VolUpMods=0
+VolDownMods=0
+EnableNotifications=true
+HotkeyNotifications=true
+MouseNotifications=false
+PopupNotifications=false
+ExternalNotifications=true
+NotificationTimeout=1500
+
+[(default)]
+Channel=Master