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

ui/steamify-ui

@@ -271,8 +271,8 @@ class Backend(QObject):
         self.busyChanged.emit()
         p.start()
 
-    @Slot("QVariant", str, bool, str, str)
-    def apply(self, ids, boot, reapply, password, hdmi):
+    @Slot("QVariant", str, bool, str)
+    def apply(self, ids, boot, reapply, password):
         try:
             if hasattr(ids, "toVariant"):  # a JS array from QML
                 ids = ids.toVariant()
@@ -281,8 +281,6 @@ class Backend(QObject):
                 args.append("--reapply")
             if boot:
                 args += ["--boot", boot]
-            if hdmi:  # rates confirmed on the HDMI screen
-                args += ["--hdmi", hdmi]
             self._start(args + [str(i) for i in (ids or [])], password)
         except Exception as e:
             # Never leave the app on the progress screen.
@@ -300,26 +298,6 @@ class Backend(QObject):
         """Only after both warnings in the app."""
         self._start(["bios-flash"], password)
 
-    @Slot(str)
-    def hdmiOptions(self, password):
-        """Reads the HDMI displays: ends with an hdmi-options event."""
-        self._start(["hdmi-options"], password)
-
-    @Slot(str, str, int, int, float, str)
-    def hdmiTry(self, password, conn, w, h, hz, rates):
-        """Switches to hz live: an hdmi-tried event says whether it worked."""
-        self._start(["hdmi-try", conn, str(w), str(h), "%g" % hz] + [r for r in rates.split(",") if r], password)
-
-    @Slot(str, str, int, int, float)
-    def hdmiReset(self, password, conn, w, h, hz):
-        """The display's own EDID and the old rate again (hdmi-reset event)."""
-        self._start(["hdmi-reset", conn, str(w), str(h), "%g" % hz], password)
-
-    @Slot(str, str)
-    def hdmiForget(self, password, display):
-        """Removes a saved display (hdmi-forgotten event)."""
-        self._start(["hdmi-forget", display], password)
-
     def _read(self, p):
         self._buf += bytes(p.readAllStandardOutput())
         while b"\n" in self._buf: