Restrict the cases where Clippy proposes to switch range types

To limit false positives, the `range_plus_one` and `range_minus_one` lints
will restrict themselves to situations where the iterator types can be easily
switched from exclusive to inclusive or vice-versa. This includes situations
where the range is used as an iterator, or is used for indexing. Also,
when the range is used as a function or method call argument and the
parameter type is generic over traits implemented by both kind of
ranges, the lint will trigger.

On the other hand, assignments of the range to variables, including
automatically typed ones or wildcards, will no longer trigger the lint.
However, the cases where such an assignment would benefit from the lint
are probably rare.

This fix doesn't prevent false positives from happening. A more complete
fix would check if the obligations can be satisfied by the new proposed
range type.

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