Non-Touch: improve bottom menu usability (#8712)

- FocusManager: allow managing sub widgets by merging their
  "layout" in the main one; make "press" support simpler by
  handling it as a fake tap event at the center of the
  focused widget.
- Setup gestures on non-touch devices for new focus manager.
- ToggleSwitch: use child layout.
- ButtonProgressWidget: use child layout.
- SpinWidget and DoubleSpinWidget: add keyboard navigation.

frontend/ui/widget/container/framecontainer.lua

@@ -41,6 +41,9 @@ local FrameContainer = WidgetContainer:new{
     invert = false,
     allow_mirroring = true,
     _mirroredUI = BD.mirroredUILayout(),
+    focusable = false,
+    focus_border_size = Size.border.window * 2,
+    focus_border_color = Blitbuffer.COLOR_BLACK,
 }
 
 function FrameContainer:getSize()
@@ -58,6 +61,27 @@ function FrameContainer:getSize()
     }
 end
 
+function FrameContainer:onFocus()
+    if not self.focusable then
+        return
+    end
+    self._origin_bordersize = self.bordersize
+    self._origin_border_color = self.color
+    self.bordersize = self.focus_border_size
+    self.color = self.focus_border_color
+    return true
+end
+
+function FrameContainer:onUnfocus()
+    if not self.focusable then
+        return
+    end
+    self.bordersize = self._origin_bordersize
+    self.color = self._origin_border_color
+    return true
+end
+
+
 function FrameContainer:paintTo(bb, x, y)
     local my_size = self:getSize()
     self.dimen = Geom:new{