CLEANUP: lists/tree-wide: rename some list operations to avoid some confusion

The current "ADD" vs "ADDQ" is confusing because when thinking in terms
of appending at the end of a list, "ADD" naturally comes to mind, but
here it does the opposite, it inserts. Several times already it's been
incorrectly used where ADDQ was expected, the latest of which was a
fortunate accident explained in 6fa922562 ("CLEANUP: stream: explain
why we queue the stream at the head of the server list").

Let's use more explicit (but slightly longer) names now:

   LIST_ADD        ->       LIST_INSERT
   LIST_ADDQ       ->       LIST_APPEND
   LIST_ADDED      ->       LIST_INLIST
   LIST_DEL        ->       LIST_DELETE

The same is true for MT_LISTs, including their "TRY" variant.
LIST_DEL_INIT keeps its short name to encourage to use it instead of the
lazier LIST_DELETE which is often less safe.

The change is large (~674 non-comment entries) but is mechanical enough
to remain safe. No permutation was performed, so any out-of-tree code
can easily map older names to new ones.

The list doc was updated.
diff --git a/addons/wurfl/wurfl.c b/addons/wurfl/wurfl.c
index 8ec1783..e9780e4 100644
--- a/addons/wurfl/wurfl.c
+++ b/addons/wurfl/wurfl.c
@@ -204,7 +204,7 @@
 		wi->data.name = strdup(args[argIdx]);
 		wi->data.type = HA_WURFL_DATA_TYPE_UNKNOWN;
 		wi->data.func_callback = NULL;
-		LIST_ADDQ(&global_wurfl.information_list, &wi->list);
+		LIST_APPEND(&global_wurfl.information_list, &wi->list);
 		++argIdx;
 	}
 
@@ -232,7 +232,7 @@
 		}
 
 		wp->patch_file_path = strdup(args[argIdx]);
-		LIST_ADDQ(&global_wurfl.patch_file_list, &wp->list);
+		LIST_APPEND(&global_wurfl.patch_file_list, &wp->list);
 		++argIdx;
 	}
 
@@ -410,12 +410,12 @@
 	ha_free(&global_wurfl.cache_size);
 
 	list_for_each_entry_safe(wi, wi2, &global_wurfl.information_list, list) {
-		LIST_DEL(&wi->list);
+		LIST_DELETE(&wi->list);
 		free(wi);
 	}
 
 	list_for_each_entry_safe(wp, wp2, &global_wurfl.patch_file_list, list) {
-		LIST_DEL(&wp->list);
+		LIST_DELETE(&wp->list);
 		free(wp);
 	}