FIX: permutate topology edges, not property mappings (#218)

* FIX: permutate topologies instead of outer edges
* MAINT: import entire `itertools` module
* MAINT: improve order of function definitions
* MAINT: improve spin-0 removal syntax
* MAINT: simplify `_KinematicRepresentation` class
* MAINT: switch to absolute imports
* MAINT: test whether final state order matters

---------

Co-authored-by: Remco de Boer <redeboer@AcerAspire>

Author: redeboer

src/qrules/__init__.py

@@ -188,10 +188,7 @@ def check_edge_qn_conservation() -> Set[FrozenSet[str]]:
     node_id = next(iter(topology.nodes))
 
     initial_facts = create_initial_facts(
-        topology=topology,
-        particle_db=particle_db,
-        initial_state=initial_state,
-        final_state=final_state,
+        topology, initial_state, final_state, particle_db
     )
 
     check_pure_edge_rules()