Adds Marianas Islands support (#1406)

* Implements #1399

* Reverting accidental change in generate_landmap.py

* Changelog update

* Import beacon data for Marianas.

Co-authored-by: Dan Albert <dan@gingerhq.net>

resources/tools/export_coordinates.py

@@ -39,6 +39,7 @@ from dcs.terrain.persiangulf import PersianGulf
 from dcs.terrain.syria import Syria
 from dcs.terrain.terrain import Terrain
 from dcs.terrain.thechannel import TheChannel
+from dcs.terrain.marianaislands import MarianaIslands
 from dcs.triggers import TriggerStart
 from pyproj import CRS, Transformer
 
@@ -59,6 +60,7 @@ ARG_TO_TERRAIN_MAP = {
     "persiangulf": PersianGulf(),
     "thechannel": TheChannel(),
     "syria": Syria(),
+    "marianaislands": MarianaIslands(),
 }
 
 # https://gisgeography.com/central-meridian/
@@ -71,6 +73,7 @@ CENTRAL_MERIDIANS = {
     "persiangulf": 57,
     "thechannel": 3,
     "syria": 39,
+    "marianaislands": 147,
 }