BUG/ENH: Fix use of ndpointer in return values

This:
* fixes a regression in 1.15, where it became impossible to set the return value of a cdll function to an ndpointer.
* removes ndpointer.__array_interface__, which was being ignored anyway in favor of the PEP3118 buffer protocol
* adds `ndpointer.contents` to recover the lost functionality, while staying in line with the ctypes behavior
* removes another instance of `descr`, which enables overlapping fields to be returned from C functions (such as unions).
* Fixes a long-term bug where using ndpointer as a return type without specifying both type and dtype would produce an object array containing a single `ndpointer`. Now the ndpointer is returned directly.

This relates to gh-12421, and likely fixes toinsson/pyrealsense#82

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