V4.26.0 rc (#2198)

* v4.26.0 Release Candidate

* Fix Wownero Creation issue

* Add KES fiat currency

* Adjust backup to default node selection if null
Gracefully handle Decred failure
Minor fixes

lib/core/utilities.dart

@@ -0,0 +1,9 @@
+extension EnhancedList<T> on Iterable<T> {
+  T? firstWhereOrNull(bool Function(T element) test) {
+    try {
+      return firstWhere(test);
+    } catch (e) {
+      return null;
+    }
+  }
+}