Review StyleCop rules.

- Enforce SA1604 ElementDocumentationShouldHaveSummary.
- Enforce SA1629 DocumentationTextShouldEndWithAPeriod.
- Turn off some rules covered by IDExxxx rules.
- Remaining rules are treated as part of OpenRA style.

OpenRA.Game/Map/CellLayer.cs

@@ -72,7 +72,7 @@ namespace OpenRA
 			return uv.V * Size.Width + uv.U;
 		}
 
-		/// <summary>Gets or sets the <see cref="CellLayer"/> using cell coordinates</summary>
+		/// <summary>Gets or sets the <see cref="CellLayer"/> using cell coordinates.</summary>
 		public T this[CPos cell]
 		{
 			get => Entries[Index(cell)];
@@ -85,7 +85,7 @@ namespace OpenRA
 			}
 		}
 
-		/// <summary>Gets or sets the layer contents using raw map coordinates (not CPos!)</summary>
+		/// <summary>Gets or sets the layer contents using raw map coordinates (not CPos!).</summary>
 		public T this[MPos uv]
 		{
 			get => Entries[Index(uv)];

OpenRA.Game/Map/CellLayerBase.cs

@@ -43,13 +43,13 @@ namespace OpenRA
 			Array.Copy(anotherLayer.Entries, Entries, Entries.Length);
 		}
 
-		/// <summary>Clears the layer contents with their default value</summary>
+		/// <summary>Clears the layer contents with their default value.</summary>
 		public virtual void Clear()
 		{
 			Array.Clear(Entries, 0, Entries.Length);
 		}
 
-		/// <summary>Clears the layer contents with a known value</summary>
+		/// <summary>Clears the layer contents with a known value.</summary>
 		public virtual void Clear(T clearValue)
 		{
 			Array.Fill(Entries, clearValue);

OpenRA.Game/Map/Map.cs

@@ -155,7 +155,7 @@ namespace OpenRA
 		public const int CurrentMapFormat = 12;
 		const short InvalidCachedTerrainIndex = -1;
 
-		/// <summary>Defines the order of the fields in map.yaml</summary>
+		/// <summary>Defines the order of the fields in map.yaml.</summary>
 		static readonly MapField[] YamlFields =
 		{
 			new MapField("MapFormat"),
@@ -993,7 +993,7 @@ namespace OpenRA
 		}
 
 		/// <summary>
-		/// The size of the map Height step in world units
+		/// The size of the map Height step in world units.
 		/// </summary>
 		/// RectangularIsometric defines 1024 units along the diagonal axis,
 		/// giving a half-tile height step of sqrt(2) * 512

OpenRA.Game/Map/MapCache.cs

@@ -43,7 +43,7 @@ namespace OpenRA
 		readonly List<MapDirectoryTracker> mapDirectoryTrackers = new List<MapDirectoryTracker>();
 
 		/// <summary>
-		/// The most recently modified or loaded map at runtime
+		/// The most recently modified or loaded map at runtime.
 		/// </summary>
 		public string LastModifiedMap { get; private set; } = null;
 		readonly Dictionary<string, string> mapUpdates = new Dictionary<string, string>();
@@ -51,7 +51,7 @@ namespace OpenRA
 		string lastLoadedLastModifiedMap;
 
 		/// <summary>
-		/// If LastModifiedMap was picked already, returns a null
+		/// If LastModifiedMap was picked already, returns a null.
 		/// </summary>
 		public string PickLastModifiedMap(MapVisibility visibility)
 		{

OpenRA.Game/Map/MapPreview.cs

@@ -63,7 +63,7 @@ namespace OpenRA
 
 	public class MapPreview : IDisposable, IReadOnlyFileSystem
 	{
-		/// <summary>Wrapper that enables map data to be replaced in an atomic fashion</summary>
+		/// <summary>Wrapper that enables map data to be replaced in an atomic fashion.</summary>
 		class InnerData
 		{
 			public int MapFormat;

OpenRA.Game/Map/PlayerReference.cs

@@ -36,7 +36,7 @@ namespace OpenRA
 		/// <summary>
 		/// Sets the "Home" location, which can be used by traits and scripts to e.g. set the initial camera
 		/// location or choose the map edge for reinforcements.
-		/// This will usually be overridden for client (lobby slot) players with a location based on the Spawn index
+		/// This will usually be overridden for client (lobby slot) players with a location based on the Spawn index.
 		/// </summary>
 		public CPos HomeLocation = CPos.Zero;