Mime can no longer write on paper without breaking their vow (#35043)

Co-authored-by: Simon <63975668+Simyon264@users.noreply.github.com>

(cherry picked from commit e86770f5a03231e3189920c5d7ad93542d48e922)

Content.Shared/Paper/BlockWritingSystem.cs

@@ -0,0 +1,20 @@
+namespace Content.Shared.Paper;
+
+/// <summary>
+/// A system that prevents those with the IlliterateComponent from writing on paper.
+/// Has no effect on reading ability.
+/// </summary>
+public sealed class BlockWritingSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<BlockWritingComponent, PaperWriteAttemptEvent>(OnPaperWriteAttempt);
+    }
+
+    private void OnPaperWriteAttempt(Entity<BlockWritingComponent> entity, ref PaperWriteAttemptEvent args)
+    {
+        args.FailReason = entity.Comp.FailWriteMessage;
+        args.Cancelled = true;
+    }
+}