v3.1.6

• added netlist_utilities::get_subgraph_function variants with and without cache
• added netlist_utilities::get_next_sequential_gates variants with and without cache
• added tests for netlist_utilities::get_next_sequential_gates
• added python bindings for gate_library_manager
• cleaned up DataContainer
• removed hidden internal cache from netlist_utilities::get_subgraph_function
• removed netlist_utilities::get_subgraph_function cycle detection due to unintended behavior
• fixed netlist parsers wrongly handling escapings within strings
• fixed netlist_utilities::copy_netlist did not copy DataContainer contents
• fixed netlist pybind handling of netlists that occasionally led to double-free segfaults
• fixed segfault in BooleanFunction::from_string when providing partial variable names