Added Multiplex Mapper for P5Outdoor8S64x32 Panel

[briggsm]

Hi! Not 100% sure I'm doing this right, but I'm trying to create a Pull Request for you to pull in the code for a new panel that doesn't currently have a Multiplex Mapper. I wrote the details of my panel & code in this issue:

#1543

Feel free to modify the code (or let me know what to change) if I didn't do this quite right.

Thank you!

[veryslow]

Hi, I just discover your post, and I guess I fighted with the same kind of outdoor panels from Eagerled (P5-O8S-SMD2727-64x32).
I wrote a mapping in an algebric way, if it helps :

void MapSinglePanel(int x, int y, int *matrix_x, int *matrix_y) const {
   int pix_nb = x+(y*64);
   *matrix_x = ((((pix_nb%64)/4)+1)*8)-((((pix_nb%1024)/512)+1)*4)+(pix_nb%4);
   *matrix_y = ((pix_nb/64)%8)+((pix_nb/1024)*8);

cheers, fabrice.