Create data binding for logged in player

```js
const dataProxy = new Proxy(data, {
set(target, property, value) {
target[property] = value;
const input = document.getElementById(property);
if (input) {
input.value = value;
}
return true;
}
});
```

We should use this object whenever we want to change something on the player.
We will need to update the elements' id fields to be consistent in their naming for this to work.
This will also require that the elements have a "oninput" event that triggers an corresponding update function which will update the underlying object.