Add animation speed slider in general tab, always collapse activeWindow

GeneralTab: add animation speed slider
Workspace: set activeWindow to always collapsed except for hover
Misc: replaced a lot of animations with Style.animationXYZ

Modules/BluetoothPanel/BluetoothPanel.qml

@@ -346,7 +346,7 @@ NPanel {
                   loops: Animation.Infinite
                   from: 0
                   to: 360
-                  duration: 2000
+                  duration: Style.animationSlow * 4
                 }
               }