Reduce php 8.2 warnings (#1)

* Reduce php 8.2 warnings

* Move traits to top of file

Author: MrEssex

src/ArrayModel.php

@@ -35,6 +35,7 @@ public function getData()
     return $this->_data;
   }
 
+  #[\ReturnTypeWillChange]
   public function jsonSerialize()
   {
     return $this->_data;

src/ViewModel.php

@@ -8,11 +8,12 @@
 
 class ViewModel implements Model, ContextAware
 {
-  protected string $_defaultView;
-
   use ContextAwareTrait;
   use WithContextTrait;
 
+  protected string $_defaultView;
+
+  #[\ReturnTypeWillChange]
   public function jsonSerialize()
   {
     $values = Objects::propertyValues($this);