Added missing '#pragma once' statements

catalogue/CreateAdminHostCmdLineArgs.hpp

catalogue/CreateAdminUserCmdLineArgs.hpp

catalogue/CreateSchemaCmdLineArgs.hpp

catalogue/DeleteAllCatalogueDataCmdLineArgs.hpp

catalogue/DropOracleCatalogueSchema.hpp

catalogue/DropSchemaCmdLineArgs.hpp

catalogue/DropSqliteCatalogueSchema.hpp

catalogue/LockSchemaCmdLineArgs.hpp

catalogue/OracleCatalogueSchema.hpp

catalogue/PollDatabaseCmdLineArgs.hpp

catalogue/SchemaStatusCmdLineArgs.hpp

catalogue/SqliteCatalogueSchema.hpp

catalogue/UnlockSchemaCmdLineArgs.hpp