guideColour in Sprite .yy files is not properly formatted

[adam-coster]

While the normal formatting rules are that array entries each go on their own line, that is not true for guideColour in sprites. This does make sense from a Git perspective, so presumably this is intended.

Need to fix the yy library for this case. Should first try a rule that says, "if all items in the array are numbers, don't use newlines". If that creates other problems, just code the exception for guideColour.

[adam-coster]

Discovered an inconsistency here, so awaiting feedback from GameMaker before updating this.

YoYoGames/GameMaker-Bugs#4713 (comment)