Add oversimplified version of No Chat Reports

This has no player-friendly UI whatsoever, doesn't work on
enforce-secure-profile servers, and has had very limited testing.

In exchange, it costs virtually nothing to maintain.

common/src/main/java/org/embeddedt/modernfix/common/mixin/feature/remove_chat_signing/ChatTrustLevelMixin.java

@@ -0,0 +1,17 @@
+package org.embeddedt.modernfix.common.mixin.feature.remove_chat_signing;
+
+import net.minecraft.client.multiplayer.chat.ChatTrustLevel;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(ChatTrustLevel.class)
+@ClientOnlyMixin
+public class ChatTrustLevelMixin {
+    @Inject(method = "evaluate", at = @At("HEAD"), cancellable = true)
+    private static void alwaysShowSecure(CallbackInfoReturnable<ChatTrustLevel> cir) {
+        cir.setReturnValue(ChatTrustLevel.SECURE);
+    }
+}

common/src/main/java/org/embeddedt/modernfix/common/mixin/feature/remove_chat_signing/ProfileKeyPairManagerMixin.java

@@ -0,0 +1,23 @@
+package org.embeddedt.modernfix.common.mixin.feature.remove_chat_signing;
+
+import net.minecraft.client.multiplayer.ProfileKeyPairManager;
+import org.embeddedt.modernfix.annotation.ClientOnlyMixin;
+import org.embeddedt.modernfix.core.config.Option;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+@Mixin(ProfileKeyPairManager.class)
+@ClientOnlyMixin
+public class ProfileKeyPairManagerMixin {
+    /**
+     * @author embeddedt
+     * @reason never use the key pair
+     */
+    @Overwrite
+    private CompletableFuture<Optional<?>> readOrFetchProfileKeyPair(Optional<?> optional) {
+        return CompletableFuture.completedFuture(Optional.empty());
+    }
+}

common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java

@@ -173,6 +173,7 @@ public DefaultSettingMapBuilder put(String key, Boolean value) {
             .put("mixin.feature.integrated_server_watchdog", true)
             .put("mixin.perf.faster_item_rendering", false)
             .put("mixin.feature.spam_thread_dump", false)
+            .put("mixin.feature.remove_chat_signing", false)
             .put("mixin.feature.snapshot_easter_egg", true)
             .put("mixin.feature.warn_missing_perf_mods", true)
             .put("mixin.feature.spark_profile_launch", false)