MAINT,ENH: Rewrite scalar math logic

This commit tries to redo the scalar math logic to take some more
care about subclasses, but most of all introduce logic to defer
to the `other` if `self` can be cast to it safely (i.e. it is
the correct promotion).

This makes things much faster and more reliable, since we now use
defer much less to `ufuncs` indirectly.
This ensures that integer overflows are reported more reliably.

Another major point about it, is that this reorganizes the coercion
of Python int, float, complex (and bool).
This should help a bit with switching to "weak" Python scalars.

This may just be a first step on a longer path...

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