Add custom report targets exhibitions and loans

src/enums/MDCustomReportTarget.php

@@ -13,6 +13,8 @@ enum MDCustomReportTarget implements MDValueEnumInterface, JsonSerializable {
 
     case object_single;
     case object_list;
+    case loan;
+    case exhibition;
 
     /**
      * Returns a value of this type based on a string.
@@ -26,6 +28,8 @@ public static function fromString(string $input):MDCustomReportTarget {
         return match($input) {
             'object_single' => self::object_single,
             'object_list' => self::object_list,
+            'loan' => self::loan,
+            'exhibition' => self::exhibition,
             default => throw new MDpageParameterNotFromListException("Unknown custom report target: " . $input),
         };