Use capitalized camel for all classes

shell/plugins/bar/widgets/Spacer.qml

@@ -0,0 +1,13 @@
+import QtQuick
+import qs.Ui
+
+BarWidget {
+  id: root
+  moduleName: "Spacer"
+
+  readonly property int span: settings && settings.size !== undefined ? Number(settings.size) : 12
+
+  implicitWidth: vertical ? barSize : span
+  implicitHeight: vertical ? span : barSize
+  visible: span > 0
+}