* Fix#6266: BaseSettingsManager::deleteAll() does use prefix as wildcard
* Enh #6271: Add input and type checks, as well as strict types to SettingsManager
* Fix#6267 SettingsManager::flushContentContainer() only clears the collection in the current instance, not the underlying cache
* Enh #6272: Always return integer from settings, if value can be converted
* Improve \humhub\libs\BaseSettingsManager::getSerialized() to allow return value be an object and throw an exception on decoding error
* Enh #6270: Add tests for SettingsManager
