Merge pull request #10415 from kevinz000/tg_update_1

Small controller/backend updates from /tg/

code/__DEFINES/callbacks.dm

@@ -1,4 +1,5 @@
 #define GLOBAL_PROC	"some_magic_bullshit"
-
+/// A shorthand for the callback datum, [documented here](datum/callback.html)
 #define CALLBACK new /datum/callback
 #define INVOKE_ASYNC world.ImmediateInvokeAsync
+#define CALLBACK_NEW(typepath, args) CALLBACK(GLOBAL_PROC, /proc/___callbacknew, typepath, args)

code/__DEFINES/qdel.dm

@@ -11,14 +11,12 @@
 #define QDEL_HINT_IFFAIL_FINDREFERENCE 6		//Above but only if gc fails.
 //defines for the gc_destroyed var
 
-#define GC_QUEUE_PREQUEUE 1
-#define GC_QUEUE_CHECK 2
-#define GC_QUEUE_HARDDELETE 3
-#define GC_QUEUE_COUNT 3 //increase this when adding more steps.
+#define GC_QUEUE_CHECK 1
+#define GC_QUEUE_HARDDELETE 2
+#define GC_QUEUE_COUNT 2 //increase this when adding more steps.
 
 #define GC_QUEUED_FOR_QUEUING -1
-#define GC_QUEUED_FOR_HARD_DEL -2
-#define GC_CURRENTLY_BEING_QDELETED -3
+#define GC_CURRENTLY_BEING_QDELETED -2
 
 #define QDELING(X) (X.gc_destroyed)
 #define QDELETED(X) (!X || QDELING(X))