fopAcM_Register cleanup (#3047)

* use macro `fopAcM_Register` more consistently

* replace fopAcM_RegisterCreateID with version that doesn't create `a_this`

src/d/actor/d_a_npc_grs.cpp

@@ -259,7 +259,7 @@ int daNpc_grS_c::CreateHeap() {
 }
 
 int daNpc_grS_c::Delete() {
-    fpc_ProcID unusedId = fopAcM_GetID(this);
+    fopAcM_RegisterDeleteID(this, "NPC_GRS");
     this->~daNpc_grS_c();
     return 1;
 }