Added ll_count implementation

Conflicts:
	tests/ll/ll_test.c
Changed file ending for avl_cardinality
Added avl_cardinality tests
Added avl_cardinality file to CMakeList
Added ht_cardinality definition
Added ht_cardinality implementation
Added a more long description to avl_crd
Added a continuous test for avl_cardinality
Added src files to cmake
Fixed an issue with a while loop counting wrong
Added ht_cardinality test
Added r_set_cardinality
Added r_set_cardinality test
Fixed attribute names
Fixed function return types of count and card