Refactor server (code improvement)

server/app/routes.php

server/src/Action/AbstractAction.php

server/src/Action/AdminFileExplorerAction.php

server/src/Action/AttributeAction.php

server/src/Action/AttributeDistinctAction.php

server/src/Action/AttributeListAction.php

server/src/Action/ClientSettingsAction.php

server/src/Action/ColumnListAction.php

server/src/Action/ConeSearchConfigAction.php

server/src/Action/CriteriaFamilyAction.php

server/src/Action/CriteriaFamilyListAction.php

server/src/Action/DatabaseAction.php

server/src/Action/DatabaseListAction.php

server/src/Action/DatasetAction.php

server/src/Action/DatasetFamilyAction.php

server/src/Action/DatasetFamilyListAction.php

server/src/Action/DatasetFileExplorerAction.php

server/src/Action/DatasetGroupAction.php

server/src/Action/DatasetGroupListAction.php

server/src/Action/DatasetListAction.php