Update lazyeval revdeps to tidy eval

[lionel-]

What?

Send pull requests to authors of packages using lazyeval. The goal is to remove the dependency on lazyeval and replace it with tidy eval.

Why?

• This is an opportunity to learn more about tidy eval and NSE.
• This is useful because it would help us to deprecate the lazyeval package in the future.

How?

• I expect a wide range of difficulty. Some packages probably use lazyeval for very simple stuff and updating those to tidy eval should be simple. Others might use it in very creative (= unexpected) ways.

• Compatibility might be a little tricky when the package relies on automatic parsing of strings. compat-lazyeval.R in the rlang repo might be useful.

• While lazyeval follows promises, tidy eval doesn't. This should normally not be a problem since the promise following can be replaced with the "quote-and-unquote" idiom.