Add WPF UniformGrid to UWP
The WPF UniformGrid (https://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.uniformgrid(v=vs.110).aspx) is missing in UWP. It doesn't seem to quite have an equivalent in UWP in order to get even spacing of a grid automatically, as well as other features like setting rows/columns and first column for calendar type applications.
Added control in 3.0
Added in 3.0 of the Windows Community Toolkit: https://github.com/Microsoft/WindowsCommunityToolkit https://docs.microsoft.com/en-us/windows/uwpcommunitytoolkit/controls/uniformgrid