Patch 5.1.1

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- 5.1.1 Changelog
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* Maps
- Fixed a crash when loading the map infos, when starting the Custom Game menu.
- Fixed issue when saving a game for a map which had multiple map layers, resulting in a crash when that game was loaded.

* Miscellaneous
- Fixed issue with getting a player's type (e.g. person, computer) through Lua, which caused problems with triggers.

* Terrain
- The snow transition graphics have been updated.
- Added new snow decoration tiles.