Distribution and Alignment enums don't correspond to UIStackView values

[rothomp3]

Really the title says it all. The values used for the Distribution and Alignment enums don't match up to the values UIStackView expects (to be fair, the original TZStackView also kind of has this problem, except for them the most-commonly-used values do line up, apparently by coincidence!). This makes it much more difficult to use as a drop-in replacement for UIStackView, since the enums have to be converted.

[Cheesebaron]

Can't fix this, because the enums are not available on older platforms.