Update MpMethodUtil (#441)

`MpMethodUtil:GetMethod` now supports indexer getters/setters and async MoveNext methods, using new Harmony 2.3 features.

`MpMethodUtil:GetLocalFunc` should now support all method types besides `MethodType.Normal`. They previously weren't supported because `MpMethodUtil:GetLocalFunc` method used the `parentMethod` argument in local function prefixes, rather than the name of the method returned by `MpMethodUtil:GetMethod`.

Source/Client/Util/MpMethodUtil.cs

@@ -63,10 +63,10 @@ public static MethodInfo GetLocalFunc(Type parentType, string parentMethod = nul
             var displayClassPrefix = $"{DisplayClassPrefix}{parentId}_";
 
             // Example: <DoWindowContents>g__Start|
-            var localFuncPrefix = $"<{parentMethod}>{LocalFunctionInfix}{localFunc}|";
+            var localFuncPrefix = $"<{parent.Name}>{LocalFunctionInfix}{localFunc}|";
 
             // Example: <DoWindowContents>g__Start|10
-            var localFuncPrefixWithId = $"<{parentMethod}>{LocalFunctionInfix}{localFunc}|{parentId}";
+            var localFuncPrefixWithId = $"<{parent.Name}>{LocalFunctionInfix}{localFunc}|{parentId}";
 
             var candidates = parentType.GetNestedTypes(AccessTools.all).
                 Where(t => t.Name.StartsWith(displayClassPrefix)).
@@ -142,12 +142,12 @@ public static MethodBase GetMethod(Type type, string methodName, MethodType meth
 
                 case MethodType.Getter:
                     if (methodName == null)
-                        return null;
+                        return AccessTools.DeclaredIndexer(type, args).GetGetMethod(true);
                     return AccessTools.DeclaredProperty(type, methodName).GetGetMethod(true);
 
                 case MethodType.Setter:
                     if (methodName == null)
-                        return null;
+                        return AccessTools.DeclaredIndexer(type, args).GetSetMethod(true);
                     return AccessTools.DeclaredProperty(type, methodName).GetSetMethod(true);
 
                 case MethodType.Constructor:
@@ -162,6 +162,11 @@ public static MethodBase GetMethod(Type type, string methodName, MethodType meth
                     if (methodName == null)
                         return null;
                     return AccessTools.EnumeratorMoveNext(AccessTools.DeclaredMethod(type, methodName, args));
+
+                case MethodType.Async:
+                    if (methodName == null)
+                        return null;
+                    return AccessTools.AsyncMoveNext(AccessTools.DeclaredMethod(type, methodName, args));
             }
 
             return null;