Apple’s Xcode 6 contains a new feature that lets developers test interfaces for “resizable iPhones” and “resizable iPads.” Allowing for adjustments for both devices alludes to possible new resolutions for both iPhone and iPad devices. While 4.7” and 5.5” iPhone models are expected at this point, allowing developers to adjust to new iPad resolutions may add some fuel to rumors of a 12” iPad, which we’ve…