Fix dump/tx of 64 bit codes

[andrasbiro]

Description:

Related issue (if applicable):
fixes missed errors in #662
partially fixes esphome/feature-requests#283
KaKu bits are looking like this:
0: h, L, h, l
1: h, l, h, L
(h=high, l=low short, L=low long)
Now, rcswitch can't handle this, but it can handle (h, l) and (h, L) - this is exactly what protocol8 does in #662

Tx still won't work, I'll add a note in the ticket about the remaining problems.

Checklist:

• The code change is tested and works locally. Tested with a coco remote and an intertechno relay (both seem to be variation of kaku)
• Tests have been added to verify that the new code works (under tests/ folder).

[depen84]

KaKu and Nexa is partly compatible and there is a PR to implement Nexa codes:
#662

[andrasbiro]

I know, I mentioned it above. However, because of the bug in dump, it wasn't really possible to use it, unless you know the code from some other source. That is fixed in this PR.

[OttoWinter]

Ah yes, thanks!