Makes sure no tag or variable error goes unnoticed.

The Core Tag logs errors that happen in other Elevar Monitoring Tags and Elevar Monitoring Variables to the devtools console.

1. Remove functionality for sending to Elevar's Endpoint.
2. Send eventName provided by error instead of trying to get it from the dataLayer.
3. Add white background to icon image to remove blue background in template addition screen.
4. Send one pixel per tag instead of one per variable error and add a version key to the pixel.
5. Fix issue with component encoding throwing when the value being encoded is not a string by always providing a string.
6. Add page url to pixel to fix issue with Safari ITP and encode pixel components.
7. Initial release.