New lint: replace place statement with drop(place)

[CAD97]

As featured in this Twitter poll.

The statement <place>; causes a move from and drop of the value at place. For clarity of intent, this is better written as drop(<place>); to emphasize the destructor is what is being invoked.

> 65% of votes on the linked poll had intuition that this (var;) did not invoke the destructor, so this lint would definitely help avoid potentially misleading code. (rustc does already lint this as path_statements, so perhaps this should instead be an improvement to that lint. rust-lang/rust#48852 is a 2018 issue to remove the lint (which is currently incorrect) for path statements that invoke a destructor.