IMemoryDomainList - downgrade from IList to IEnumerable, refactor a spot that needed something more than that

BizHawk.Client.Common/lua/EmuLuaLibrary.Memory.cs

@@ -63,9 +63,11 @@ namespace BizHawk.Client.Common
 		{
 			var table = Lua.NewTable();
 
-			for (int i = 0; i < DomainList.Count; i++)
+			int i = 0;
+			foreach (var domain in DomainList)
 			{
-				table[i] = DomainList[i].Name;
+				table[i] = domain.Name;
+				i++;
 			}
 
 			return table;

BizHawk.Emulation.Common/Interfaces/IMemoryDomains.cs

@@ -14,7 +14,7 @@ namespace BizHawk.Emulation.Common
 		IMemoryDomainList MemoryDomains { get; }
 	}
 
-	public interface IMemoryDomainList : IList<MemoryDomain>
+	public interface IMemoryDomainList : IEnumerable<MemoryDomain>
 	{
 		MemoryDomain this[string name] { get; }