Fix handling all color types in pygame.transform.threshold
#3156
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The c internal function
_color_from_obj
only allows mapped colors for some reason, but all color arguments in the stubs forpygame.transform.threshold
pretend to allowColorLike
which also allows strings. My modification makes sure all the promised color types are allowed and add a test to make sure it doesn't break in the future.pygame.transform.threshold
should be the only function using the internal c function because all new api coming for transform is going to use the pygame C api function by default.