ui: Begin GUI

The GUI shows a screenshot of each monitor, as well as the title and URL
of the page being displayed.  There's also a button to trigger a page
reload on the remote machine.

hudctrl.code-workspace

@@ -0,0 +1,17 @@
+{
+	"folders": [
+		{
+			"name": "ui",
+			"path": "ui"
+		},
+		{
+			"name": "svc",
+			"path": "svc"
+		},
+		{
+			"name": "aiomarionette",
+			"path": "../aiomarionette"
+		}
+	],
+	"settings": {}
+}