[9.21] New Grand Battles Map Klondike + Map Changes

Patch Notes  MapsKlondike: added the new map of the winter setting (1.4х1.4 km) for Grand Battles. The following battle types are available: Standard Battle, Encounter Battle. At the same time:To play Encounter Battles on the Klondike map, the Encounter Battle and Grand Battle options should be enabled in the game settings.Introduced terrain-related changes to hard-to-reach areas on the following maps:Swamp Serene Coast Redshire Ruinberg Fisherman's Bay Malinovka Fjords Sand River Pilsen Airfield Tundra Cliff