Fix unintended sweep copying introduced in !486

src/blockforest/CMakeLists.txt

src/core/selectable/SelectableObject.h

src/timeloop/SweepTimeloop.cpp

tests/timeloop/CMakeLists.txt

tests/timeloop/MultipleSweepFailTest.cpp

tests/timeloop/MultipleSweepTest.cpp

tests/timeloop/TimeloopAndSweepRegisterTest.cpp

tests/timeloop/TimeloopSweepManagementTest.cpp