Add 1/8 bit palette export support (patch <https://www.blogger.com/blog/post/edit/4095507683943629087/1750201294125047429#> , patch <https://www.blogger.com/blog/post/edit/4095507683943629087/1750201294125047429#> )
Next: There's still some work to be done with integrating the png filter data before integrating so going to create more tests
