Allow access to typers programmatically

[josephgeis]

By exporting typers in the TyperSetup() method to the window object, created typers can be access elsewhere in JavaScript. I think this would be a beneficial and minor edit that will allow typers to be activated based on scroll position and other developer-created optimizations.

[josephgeis]

Just wondering if you've seen this.

[straversi]

Now I've seen it! I'm revisiting this repo after quite a while.

I've actually been experimenting lately with combining Typer, Cursor, and TyperSetup into a single Typer global object. So I'm in support of revealing the Typers globally, but through an object that can consolidate the other stuff.