Add support for classes in the global namespace, like DateTime

Author: Sander van der Vlugt

src/Reflection/ReflectionClass.php

@@ -311,7 +311,7 @@ public function getProperties(): array
                 // would not be parsed.
                 //
                 // Skip T_STRING and "?" because if it exists, it must be a type declaration.
-                $var_loc = $tokens->next($vis_loc, [T_COMMENT, T_WHITESPACE, T_STATIC, T_FINAL, T_STRING, '?']);
+                $var_loc = $tokens->next($vis_loc, [T_COMMENT, T_WHITESPACE, T_STATIC, T_FINAL, T_STRING, '?', T_NAME_FULLY_QUALIFIED]);
                 if ($tokens->type($var_loc) !== T_VARIABLE) {
                     continue;
                 }

test/Generator/fixtures/Annotations.php

@@ -12,5 +12,5 @@ class Annotations
      * @AG\Generate(type="\DateTime")
      * @Stupid\Really
      */
-    public $stupid;
+    public ?\DateTime $stupid;
 }