Wool: Use adv- and optipng to optimise texture files

mods/wool/textures/wool_black.png

mods/wool/textures/wool_blue.png

mods/wool/textures/wool_cyan.png

mods/wool/textures/wool_dark_green.png

mods/wool/textures/wool_dark_grey.png

mods/wool/textures/wool_green.png

mods/wool/textures/wool_grey.png

mods/wool/textures/wool_magenta.png

mods/wool/textures/wool_orange.png

mods/wool/textures/wool_pink.png

mods/wool/textures/wool_red.png

mods/wool/textures/wool_violet.png

mods/wool/textures/wool_white.png

mods/wool/textures/wool_yellow.png