DEPR: remove itemsize, data, base, flags, strides
and un-deprecated `item`, though im not sure where that goes in the whatsnew
You will need to remove some things from the API docs (that's what the doc failure is complaining about) Will update per comments.  Also need to change the implementation so item() raises for len!=1 Can you leave the `item` change for a separate PR? 
That change deserves specific attention I think, not hidden in an "easy remove some stuff" PR > Can you leave the item change for a separate PR?

Sounds good updated+green, un-doing `item` changes lgtm, need a rebase rebased+green Thanks @jbrockmendel 