Adds a map with eBird alert locations as markers.
Works on any alerts page, including ABA and regional: Needs, Yearly Needs, Rare.
Should work fine on mobile!
Example Rare Alerts page: https://ebird.org/alert/summary?sid=SN35818
known issue: Details button in map popups can't be clicked
note: I had to add 9999 to the front of the version number due to greasyfork's unexpected manner of parsing dates in version numbers.
