refactor: apply TYPO3 13 Rector and Fractor migrations

Automated migrations from rector.php and fractor.php (TCA, Extbase
controllers and annotations, ViewHelpers, QueryBuilder, FlexForms,
TypoScript conditions).

Plugins stay list_type plugins: Rector switched them to content
element types, which needs a tt_content migration. That is deferred to
the TYPO3 14 step, where list_type is removed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/ext_emconf.php

@@ -7,11 +7,7 @@ $EM_CONF[$_EXTKEY] = [
     'author' => 'Björn Fromme',
     'author_email' => '[email protected]',
     'state' => 'beta',
-    'internal' => '',
-    'uploadfolder' => true,
-    'createDirs' => '',
     'dividers2tabs' => true,
-    'clearCacheOnLoad' => 0,
     'version' => '3.0.0',
     'constraints' => [
         'depends' => [],