Major overhauling - big collection of micro fixes and PHPDoc update.

Micro optimization in GeneralAjax and fixed indention in GeneralAjax.

Reworked PHPDoc in:
- GeneralCallbackDefault.php
- GeneralCollectionDefault.php
- GeneralDataDefault.php
- GeneralDataMultiLanguageDefault.php
- GeneralDataTableRowsAsRecords.php
- GeneralModelDefault.php
- InterfaceGeneralCallback.php
- InterfaceGeneralCollection.php
- InterfaceGeneralData.php
- InterfaceGeneralDataMultiLanguage.php
- InterfaceGeneralModel.php