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.Mods.Common/Widgets/Logic/Ingame/CommandBarLogic.cs

@@ -19,7 +19,7 @@ using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
 {
-	/// <summary> Contains all functions that are unit-specific. </summary>
+	/// <summary>Contains all functions that are unit-specific.</summary>
 	public class CommandBarLogic : ChromeLogic
 	{
 		readonly World world;