ptrarray: Handle realloc() failure in ptr_array_insert()

ptr_array_insert() assigned the result of realloc() directly to
pa->pdata and bumped the capacity without checking for failure, so on
out-of-memory the old buffer was leaked and the following store or
memmove() wrote through a NULL pointer.

Keep the old buffer on failure and return -1 from ptr_array_insert()
and ptr_array_add(). The callers now handle the error:

- the array lookup cache (plist.c) is dropped instead of silently going
  out of sync with the node list; lookups then fall back to walking
  the children, as they do before the cache exists
- bplist parsing (used_indexes) and serialization (objects) return
  PLIST_ERR_NO_MEM; ignoring the error in parse_bin_node_at_index()
  would otherwise loop forever since the array never grows

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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