Improve error messages for filter functions

Can we special case the error message for filter functions that have been renamed? For example:

-- NAMING ERROR ------------------------------ src/Transmutable/Html/Parser.gren

I cannot find a `Array.filter` variable:

433|                             Array.filter (\c -> c == '\n' || c == '\r') chars
                                 ^^^^^^^^^^^^
The `Array` module does not expose a `filter` variable. These names seem close
though:

    Array.foldr
    Array.first
    Array.flatten
    Array.foldl

Hint: Read <https://github.com/gren-lang/compiler/blob/0.5.2/hints/imports.md>
to see how `import` declarations work in Gren.

Should suggested that you probably want keepIf instead of doing a typo check.

Start by locating the compiler diagnostic handling for missing module members and renamed functions; the example is in src/Transmutable/Html/Parser.gren. Run the compiler on that example and verify that a missing Array.filter reference suggests keepIf when appropriate.