Refactor `yield`ing methods to conventional LINQ

src/BizHawk.Client.Common/movie/tasproj/StateDictionary.cs

@@ -2,6 +2,7 @@ using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.Linq;
 using BizHawk.Common;
 
 namespace BizHawk.Client.Common
@@ -86,10 +87,7 @@ namespace BizHawk.Client.Common
 		}
 
 		public IEnumerator<KeyValuePair<int, byte[]>> GetEnumerator()
-		{
-			foreach (var kvp in _streams)
-				yield return new KeyValuePair<int, byte[]>(kvp.Key, this[kvp.Key]);
-		}
+			=> _streams.Select(kvp => new KeyValuePair<int, byte[]>(kvp.Key, this[kvp.Key])).GetEnumerator();
 
 		public bool Remove(int key)
 		{

src/BizHawk.Client.EmuHawk/Extensions/ToolExtensions.cs

@@ -1,6 +1,7 @@
 using System.IO;
 using System.Collections.Generic;
 using System.Globalization;
+using System.Linq;
 using System.Windows.Forms;
 
 using BizHawk.Common;
@@ -238,8 +239,7 @@ namespace BizHawk.Client.EmuHawk.ToolExtensions
 		}
 
 		public static IEnumerable<ToolStripItem> MenuItems(this IMemoryDomains domains, Action<string> setCallback, string selected = "", int? maxSize = null)
-		{
-			foreach (var domain in domains)
+			=> domains.Select(domain =>
 			{
 				var name = domain.Name;
 				var item = new ToolStripMenuItem
@@ -249,9 +249,7 @@ namespace BizHawk.Client.EmuHawk.ToolExtensions
 					Checked = name == selected
 				};
 				item.Click += (o, ev) => setCallback(name);
-
-				yield return item;
-			}
-		}
+				return item;
+			});
 	}
 }

src/BizHawk.Common/Extensions/ReflectionExtensions.cs

@@ -94,14 +94,7 @@ namespace BizHawk.Common.ReflectionExtensions
 		/// Takes an enum Type and generates a list of strings from the description attributes
 		/// </summary>
 		public static IEnumerable<string> GetEnumDescriptions(this Type type)
-		{
-			var vals = Enum.GetValues(type);
-
-			foreach (var v in vals)
-			{
-				yield return v.GetDescription();
-			}
-		}
+			=> Enum.GetValues(type).Cast<Enum>().Select(static v => v.GetDescription());
 
 		public static T GetAttribute<T>(this object o)
 		{

src/BizHawk.Emulation.Common/Base Implementations/Axes/AxisDict.cs

@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Linq;
 
 namespace BizHawk.Emulation.Common
 {
@@ -59,12 +60,7 @@ namespace BizHawk.Emulation.Common
 		public bool ContainsKey(string key) => _keys.Contains(key);
 
 		public IEnumerator<KeyValuePair<string, AxisSpec>> GetEnumerator()
-		{
-			foreach (var key in _keys)
-			{
-				yield return new(key, _specs[key]);
-			}
-		}
+			=> _keys.Select(key => new KeyValuePair<string, AxisSpec>(key, _specs[key])).GetEnumerator();
 
 		IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 

src/BizHawk.Emulation.Common/Base Implementations/MemoryCallbackSystem.cs

@@ -218,40 +218,10 @@ namespace BizHawk.Emulation.Common
 		}
 
 		public IEnumerator<IMemoryCallback> GetEnumerator()
-		{
-			foreach (var imc in _reads)
-			{
-				yield return imc;
-			}
-
-			foreach (var imc in _writes)
-			{
-				yield return imc;
-			}
-
-			foreach (var imc in _execs)
-			{
-				yield return imc;
-			}
-		}
+			=> _reads.Concat(_writes).Concat(_execs).GetEnumerator();
 
 		IEnumerator IEnumerable.GetEnumerator()
-		{
-			foreach (var imc in _reads)
-			{
-				yield return imc;
-			}
-
-			foreach (var imc in _writes)
-			{
-				yield return imc;
-			}
-
-			foreach (var imc in _execs)
-			{
-				yield return imc;
-			}
-		}
+			=> GetEnumerator();
 	}
 
 	public class MemoryCallback : IMemoryCallback