Minor UI tweaks and clean up project.

imports/Spectral/Setting/Setting.qml

@@ -5,11 +5,11 @@ import Qt.labs.settings 1.0
 Settings {
     property bool showNotification: true
 
-    property bool pressAndHold
     property bool showTray: true
 
     property bool darkTheme
 
-    property bool enableTimelineBackground: true
     property string timelineBackground
+
+    property string fontFamily: "Roboto,Noto Sans,Noto Color Emoji"
 }