Add Modal component

components/Modal.slint

@@ -0,0 +1,31 @@
+import { Palette } from "Palette.slint";
+
+export component Modal inherits Rectangle {
+	init() => {
+		if (self.absolute-position.x < 500px) {
+			self.x += 500px - self.absolute-position.x;
+		}
+	}
+
+	public function show() {
+	    popup.show()
+	}
+
+	public function close() {
+	    popup.close()
+	}
+
+	popup := PopupWindow {
+		close-policy: close-on-click-outside;
+		background := Rectangle {
+			height: 100%;
+			width: 100%;
+			background: Palette.background1;
+			border-color: Palette.popup-border;
+			border-width: 1px;
+			border-radius: 4px;
+		}
+
+		@children
+	}
+}