Add test setup for set test
Add test for init along with setup/teardown functionality
Add test for set init-deinit
Add testing setup for testing element behaviour of the set type
Add insert test for set type
Add insert/remove test for set type
Add insert-get-remove test for set type
Add multi-set setup/teardown
Add union test for set type
Add intersection test to set testing
Fix: Use #define for N_TEST_OBJS
Add xor set test
Add subset
Add cardinality test for set type
Add set select test
Revert "Simplify list by moving prefix in iteration"

This reverts commit 9746f0c5bd28ecac8e91e481d451a3da34c92b8a.

Conflicts:
	tests/check/objects/CMakeLists.txt

"set" was also renamed to "ws_set" here.
Outcomment: test for set union
Outcommented: test for set intersection
Outcommented: test for set xor
Outcommented: test for set is-subset