refactor(ui): One QML file per screen; the HDMI boost's setup screens and backend commands removed

ui/qml/Chip.qml

@@ -0,0 +1,12 @@
+// A small label in capitals.
+import QtQuick
+
+Rectangle {
+    id: chip
+    property string text
+    property color fg: Theme.good
+    property color bgc: Theme.goodBg
+    height: 24; radius: 6; width: ct.implicitWidth + 16; color: bgc
+    Text { id: ct; anchors.centerIn: parent; text: chip.text.toUpperCase(); color: chip.fg
+           font.family: Theme.body; font.pixelSize: 12; font.weight: Font.DemiBold; font.letterSpacing: 0.6 }
+}