Added list of homoglyphs for name comparison

Unicode is now allowed in player names, but it can't be easily exploited anymore

Subsurface/Barotrauma.csproj

@@ -170,6 +170,7 @@
     <Compile Include="Source\Screens\NetLobbyVoting.cs" />
     <Compile Include="Source\Screens\ServerListScreen.cs" />
     <Compile Include="Source\Timing.cs" />
+    <Compile Include="Source\Utils\Homoglyphs.cs" />
     <Compile Include="Source\Utils\MTRandom.cs" />
     <Compile Include="Source\Utils\Rand.cs" />
     <Compile Include="Source\Events\PropertyTask.cs" />

Subsurface/Source/Networking/Client.cs

@@ -87,7 +87,7 @@ namespace Barotrauma.Networking
                 c != '<' &&
                 c != '/'));
         }
-
+        
         public static string SanitizeName(string name)
         {
             name = name.Trim();
@@ -98,9 +98,8 @@ namespace Barotrauma.Networking
             string rName = "";
             for (int i=0;i<name.Length;i++)
             {
-                if (name[i] < 32 || name[i] > 126)
+                if (name[i] < 32)
                 {
-                    //TODO: allow safe unicode characters, this is just to prevent players from taking names that look similar but aren't the same
                     rName += '?';
                 }
                 else

Subsurface/Source/Networking/GameServerLogin.cs

@@ -138,7 +138,7 @@ namespace Barotrauma.Networking
                 DebugConsole.NewMessage(name + " couldn't join the server (wrong content package hash)", Color.Red);
                 return;
             }
-            else if (connectedClients.Any(c => c.name.ToLower() == name.ToLower() && c.Connection != inc.SenderConnection))
+            else if (connectedClients.Any(c => Homoglyphs.Compare(c.name.ToLower(),name.ToLower()) && c.Connection != inc.SenderConnection))
             {
                 inc.SenderConnection.Disconnect("The name \"" + name + "\" is already in use. Please choose another name.");
                 DebugConsole.NewMessage(name + " couldn't join the server (name already in use)", Color.Red);