4x4x4 Cube: algorithm sets

Parity (2)

Fixes for the two parity cases that can happen on even-sized cubes.

Simulated in the tests: each leaves centres alone and keeps every edge paired. OLL parity flips one edge pair. PLL parity swaps two edge pairs and changes nothing else.

Rw U2 x Rw U2 Rw U2 Rw' U2 Lw U2 Rw' U2 Rw U2 Rw' U2 Rw' — OLL parity

2R2 U2 2R2 Uw2 2R2 2U2 — PLL parity