Improve flexibility of scope type properties

Improves the flexibility of scope type properties by removing conditional logic specific to the date and daterange scope types and laying the groundwork for scopes to define their own custom properties that can be loaded from the scope configuration defined by the developer.

modules/backend/widgets/Filter.php

@@ -463,17 +463,33 @@ public function addScopes(array $scopes)
             }
 
             /*
-             * Ensure dates options are set
+             * Ensure scope type options are set
              */
-            if (!isset($config['minDate'])) {
-                $scopeObj->minDate = '2000-01-01';
-                $scopeObj->maxDate = '2099-12-31';
+            $scopeProperties = [];
+            switch ($scopeObj->type) {
+                case 'date':
+                case 'daterange':
+                    $scopeProperties = [
+                        'minDate'   => '2000-01-01',
+                        'maxDate'   => '2099-12-31',
+                        'yearRange' => 10,
+                    ];
+
+                    break;
+            }
+
+            foreach ($scopeProperties as $property => $value) {
+                if (isset($config[$property])) {
+                    $value = $config[$property];
+                }
+
+                $scopeObj->{$property} = $value;
             }
 
             $this->allScopes[$name] = $scopeObj;
         }
     }
-    
+
     /**
      * Programatically remove a scope, used for extensibility.
      * @param string $scopeName Scope name