Plus42 Equations, Preview Release

[Thomas Okken]

New update:

1. Improved decimal Y^X, as discussed in this thread.
2. Android and iOS versions: tweaked the PortraitShort skin layout. Because of the way I programmatically generated this skin from the full-size PortraitTall skin, the keys' sensitive rectangles ended up not extending below the keys, and as a result, it was rather easy to hit the key below the one you were aiming for. This would happen to me all the time, anyway -- I use a phone with a 9:16 screen so PortraitShort is selected by default; people with iPhone X series phones or anything else with 9:19.5 screens may never have noticed any problem.