MO: I-435 & US50 @ KS line

[yakra]

Exit 75B probably dates to the earliest days of "Clinched Interstate Mapping", before Tim had solidified his own "1 Point Per Interchange" rule, even for interchanges centered perfectly on a state line.
This is better off merged into the KS/MO point. As it's not in use, it can simply be deleted from both files.
This would eliminate several NMPs affecting both MO and KS.

[Highway63]

I don't know if it's "one point per interchange" so much as separating the exit from the state line. The KS/MO point needs to stay, obviously. If anyone used 75B, I could see an argument for keeping it as a secondary label. But I will delete it entirely.

Might as well recenter 75A and 74 while I'm at it.