Recolor

After a while, new zombies are added, it's time for another recolor.
This is pretty straignhforward:
* Fungal boomber: ltgray B -> ltgray_magenta Z
* Zombie master: pink -> pink_red 
He deserve more attention and highlight, not to be mistaken for a lowly boomer
* Zombie dancer: white_magenta -> blue_magenta
Not to be mistaken with a hulk, which can cost you dearly.