Did this for Normandy 2... but unsurprisingly there aren't a whole lot
of beacons in a WW2 map.
(cherry picked from commit 410c25b331308c7e849b9925d6c59b9ef3e035f9)
* Implements #1399
* Reverting accidental change in generate_landmap.py
* Changelog update
* Import beacon data for Marianas.
Co-authored-by: Dan Albert <dan@gingerhq.net>