[ALOY-547] TSS selector Widget doesn't work like Require does

Assuming you have an index.xml like:

<Alloy>
  <Window>
    <Widget src="my.allow.widget" id="myId" />
  </Window>
</Alloy>

And an index.tss like:

"Widget": {
  top: 50
}

The compiled index.js will contain:

$.__views.myId = Alloy.createWidget("my.allow.widget", "widget", {
  id: "myId"
});

While the following index.tss:

"Require": {
  top: 50
}

Results in the expected:

$.__views.myId = Alloy.createWidget("my.allow.widget", "widget", {
  top: 50,
  id: "myId"
});

I've ran into more examples where <Widget /> does not inherit all functionality of <Require /> in a correct way. Maybe it would be good idea just to replace <Widget /> by <Require type="widget" /> as the first step in compilation so we don't have to take care of <Widget /> anymore in the further compilation process?