outbound-link component

[caseyyee]

Allows you to specify web links within Unity.

[caseyyee]

Appropriate events are being handled now, should just work.

May need to add a in-VR loading lobby so that users are not left in blackness while unity loads.

[cvan]

@caseyyee when you get a chance, can you open a PR (even if it's a WIP) for https://github.com/caseyyee/unity-webvr-export/tree/links? thanks!

[caseyyee]

Now that @cvan has landed inbound links with b133289, we'll need a component that makes it easy to create links within unity.