Add a (likely temporary) RimHUD compat (#385)

There's currently a pending PR for RimHUD which will fix the issue, so I've included a simple check if the mod itself had the built-in compat fixed.

Jaxe-Dev/RimHUD#12

Source/Mods/RimHUD.cs

@@ -0,0 +1,44 @@
+using System;
+using HarmonyLib;
+using Multiplayer.API;
+using Verse;
+
+namespace Multiplayer.Compat
+{
+    /// <summary>RimHUD by Jaxe</summary>
+    /// <see href="https://github.com/Jaxe-Dev/RimHUD"/>
+    /// <see href="https://steamcommunity.com/sharedfiles/filedetails/?id=1508850027"/>
+    [MpCompatFor("jaxe.rimhud")]
+    public class RimHUD
+    {
+        public RimHUD(ModContentPack mod)
+        {
+            // The current RimHUD compat calls `Traverse.Method(string, object[])`, but due to ambiguous match
+            // it fails to get the correct RegisterSyncMethod method. The fix would be to use the alternative
+            // method which provides arguments for the method.
+            // The compat likely broke due to changes in Harmony, likely to prevent it from arbitrarily
+            // selecting a method when there was an ambiguous match (like how it happens right now).
+
+            var type = AccessTools.TypeByName("RimHUD.Integration.Multiplayer.Mod_Multiplayer");
+
+            // Currently has a pending PR to fix the compat
+            // https://github.com/Jaxe-Dev/RimHUD/pull/12
+            var newMethod = AccessTools.DeclaredMethod(
+                typeof(Traverse), nameof(Traverse.Method), new []{ typeof(string), typeof(Type[]), typeof(object[]) });
+            var instr = PatchProcessor.GetCurrentInstructions(
+                AccessTools.DeclaredConstructor(type, Type.EmptyTypes));
+
+            // Check which if the constructor calls `Traverse.Method(string, Type[], object[])`, which
+            // is the simplest and most obvious fix and the on implemented in the PR.
+            if (instr.Any(ci => ci.Calls(newMethod)))
+            {
+                Log.Warning("RimHUD doesn't need MP Compatibility patch, the original mod compat was fixed.");
+                return;
+            }
+
+            // The mod technically has a few more sync methods, but those
+            // aren't necessary as it's stuff MP syncs itself.
+            MP.RegisterSyncMethod(AccessTools.DeclaredMethod(type, "SetSelfTend"));
+        }
+    }
+}