"colour" to "color": tags to alias

With apologies to her majesty the Queen and her English

coloured pencil (35), coloured pencil drawing (9) -> colored pencil drawing (1571) because “colored pencil” is already aliased to that
digital colours (14) -> (digital color (12) <-> digitally colored (32))
colourful (111) -> colorful (328)
bright colours (13), bright colors (1), vibrant colours (8), vibrant colors (0) -> colorful (328)
colour guide (8), colour chart (3), color chart (0) -> reference sheet because “color guide” is already aliased to “reference sheet”
colours (9) -> colors (119) (which seems to be a mix of “colorful” and “reference sheet” so it might not exist if cleaned up)
messy colouring (12) -> messy coloring (1) or figure out something better
wrong tail colour (4) -> wrong tail color (0) or figure out something better
different muzzle colour (3) -> colored muzzle (53)

piebald colouring (93) vs. piebald (9) -> refer to the thread Coat markings tag implications/descriptions which was discussing whether to keep piebald at all or alias it to pinto..?

colored muzzle -> imply facial markings, coat markings or else alias to snip (coat marking); again, refer to the thread Coat markings tag implications/descriptions

two colour hair (132) -> two color hair (31)
and/or -> two toned hair (56)
with potential inclusion of two toned mane, refer to this thread about mane/hair

Bump.

@Background Pony #DC8A
Most done, I’ll try to go through the ones wrapped up in other threads later.