Calculate an antimeridian-adjusted bounding box in tileset metadata (#82)

* Calculate a new antimeridian-adjusted bounding box

* Add antimeridian bounding box to pmtiles, dirtiles, and tile-join

* Don't take out-of-bounds latitudes into account in the adjusted bbox

* Update changelog

* Forgot to adjust tests after the last change

serial.hpp

@@ -88,6 +88,9 @@ struct reader {
 
 	long long file_bbox[4] = {0, 0, 0, 0};
 
+	long long file_bbox1[4] = {0xFFFFFFFF, 0xFFFFFFFF, 0, 0};  // standard -180 to 180 world plane
+	long long file_bbox2[4] = {0x1FFFFFFFF, 0xFFFFFFFF, 0x100000000, 0};  // 0 to 360 world plane
+
 	struct stat geomst {};
 
 	char *geom_map = NULL;