Added Polls and locking raids if not enough users are signed up

needs testing

Lieb/Models/Poll/PollAnswer.cs

@@ -0,0 +1,11 @@
+namespace Lieb.Models.Poll
+{
+    public class PollAnswer
+    {
+        public int PollAnswerId { get; set; }
+
+        public int? PollOptionId { get; set; }
+
+        public ulong UserId { get; set; }
+    }
+}