change linked_list.c to allow custom data in nodes + implement cx_kv_list_set_key()

add failing test case test_kv_list_set_key()

implement a patch function that results in (almost) always calling the correct destructors

fix that the fallthrough attributes were not abstracted by the cx_attr macros

(0) -1000 -300 -100 -30 -10 -4 +4 tip

mercurial