Reworked weapon documentation generation

Switched the Utility's ExtractWeaponDocsCommand output to JSON.
Added a Python script to generate documentation Markdown from JSON.

OpenRA.Mods.Common/Util.cs

@@ -13,6 +13,7 @@ using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
+using System.Reflection;
 using OpenRA.GameRules;
 using OpenRA.Mods.Common.Traits;
 using OpenRA.Primitives;
@@ -298,6 +299,23 @@ namespace OpenRA.Mods.Common
 			return t.Name;
 		}
 
+		public static string GetAttributeParameterValue(CustomAttributeTypedArgument value)
+		{
+			if (value.ArgumentType.IsEnum)
+				return Enum.Parse(value.ArgumentType, value.Value.ToString()).ToString();
+
+			if (value.ArgumentType == typeof(Type) && value.Value != null)
+				return (value.Value as Type).Name;
+
+			if (value.ArgumentType.IsArray)
+			{
+				var names = (value.Value as IReadOnlyCollection<CustomAttributeTypedArgument>).Select(x => (x.Value as Type).Name);
+				return string.Join(", ", names);
+			}
+
+			return value.Value?.ToString();
+		}
+
 		public static int GetProjectileInaccuracy(int baseInaccuracy, InaccuracyType inaccuracyType, ProjectileArgs args)
 		{
 			var inaccuracy = ApplyPercentageModifiers(baseInaccuracy, args.InaccuracyModifiers);