Rewrite planemap and idalloc in pure C++

luprex/syscpp/main.cpp

@@ -180,6 +180,8 @@ static int pmain(lua_State *L)
 
     LUAJIT_VERSION_SYM(); /* Linker-enforced version check. */
 
+    LuaStack::register_all_userdata(L);
+    
     // Initialize the builtins, then copy a snapshot of the
     // builtins to the registry.  This will allow us to restore
     // the builtins during source_rebuild operations.