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_drainSol.cpp

@@ -174,7 +174,7 @@ int daNpcDrSol_c::CreateHeap() {
 }
 
 int daNpcDrSol_c::Delete() {
-    fpc_ProcID id = fopAcM_GetID(this);
+    fopAcM_RegisterDeleteID(this, "NPC_DRSOL");
     this->~daNpcDrSol_c();
     return 1;
 }