Archaeology Sites WTF

UPDATED FOR 3.8!
Clears out completed archaeology sites automatically, once a year. Leaves the deposits behind, so you’ll still get the minor artifacts that you can collect from some of them.
Update on behavior: I noticed that if you complete a site really close to the end of the year, sometimes it gets cleared before some events can finish and breaks things. Added a one year delay. So now sites will be cleared 1-2 years after they are completed.
Thanks to mzilli for Destroy Archeological Sites, it helped me figure out how some of this works. I recommend you grab that mod as well, because it will let you manually delete a site in case mine misses any.
Revisions:
Old revisions of this mod are available below. Click the link to download.
