Release 1.16 #476

It's been three months since 1.15, and the 1.16 milestone has accumulated several nice features:

• py.typed (requiested in BLD: include py.typed in package #437 (comment))
• perf improvements in clip, reshape, fft
• helpers for mparray and dpnp

I'm planning to cut the 1.16 release "soon". Please speak up if there's something you'd want to include into 1.16 specifically.