Add constants for Direction2d and Direction3d
#11180
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Jondolf
added
C-Usability
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Objective
I often need a direction along one of the cartesian XYZ axes, and it currently requires e.g.
Direction2d::from_normalized(Vec2::X), which isn't ideal.Solution
Add direction constants that are the same as the ones on Glam types. I also copied the doc comment format "A unit vector pointing along the ... axis", but I can change it if there's a better wording for directions.