"Bundle To Export" uses dropdown instead

[OwenTheProgrammer]

Github did some things I didnt like, so im re-pulling this.

The only change here is "Bundle To Export" now creates a dropdown with your projects asset bundle list instead of depending on a text field.

• If the PlayerPrefs asset bundle goes missing, it will be shown as whatever (missing)
• If there are no asset bundles found, it will create "bundle" as the default, helpfully denoted as bundle (default)
• If for some reason the array is null after trying to find the bundles in the project, it will default back to the original string method.

I have tested a few cases where id expect this to fail, and I've also added a toggle to revert back to the old string method, if someone wants to do that.