Librarian gameplay (DND, but in SS14) (#17041)

* D&D character sheets

* Tabletop improvements

* Grass battlemap

* You can now put shit inside of the board

* change variable name

* make the grass tabletop better, again

* update the damn thing AGAIN

* update the shit AGAIN

* You can now take stuff out of tabletops

* Make it use parenting to avoid zany bugs

* MORE battlemaps! Battlemaps for everyone!

* You can now dump out pieces + cleanup

* All (most) non-game pieces should fall to the ground

* make the verb a bit more responsive

* Librarian content officially done

* fix tests i think

* i forgot the sheet

* Smidgen of refactoring

* You can no longer put high risk items inside of boards

* no boardgame defusal

* minor refactoring

* hoplogrma

* doc

* fix rt

Content.Server/Tabletop/TabletopEmptySetup.cs

@@ -0,0 +1,14 @@
+using JetBrains.Annotations;
+
+namespace Content.Server.Tabletop
+{
+    [UsedImplicitly]
+    public sealed class TabletopEmptySetup : TabletopSetup
+    {
+        public override void SetupTabletop(TabletopSession session, IEntityManager entityManager)
+        {
+            var board = entityManager.SpawnEntity(BoardPrototype, session.Position.Offset(0, 0));
+            session.Entities.Add(board);
+        }
+    }
+}