Namespaced cta::make_unique to not conflict with std::make_unique on newer compilers

catalogue/CatalogueFactory.cpp

catalogue/OracleCatalogue.cpp

catalogue/RdbmsCatalogue.cpp

catalogue/SqliteCatalogue.cpp

rdbms/ConnFactoryFactory.cpp

rdbms/ConnFactoryFactory_OCCI_SUPPORT_OFF.cpp

rdbms/OcciConn.cpp

rdbms/OcciEnv.cpp

rdbms/OcciStmt.cpp

rdbms/SqliteConn.cpp

rdbms/SqliteConnFactory.cpp

rdbms/SqliteStmt.cpp

scheduler/SchedulerTest.cpp

...castor/tape/tapeserver/daemon/DataTransferSessionTest.cpp

xroot_plugins/XrdCtaFilesystem.cpp