Specifically for Neovim which contains code like:

```c
Dictionary nvim_eval_statusline(String str, Dict(eval_statusline) *opts, Arena *arena, Error *err)
  FUNC_API_SINCE(8) FUNC_API_FAST
{
  ...
}
```

Now allows `<string> <identifier> ...` forms of concatenations.

Co-authored-by: Denny Sun <dennys@microsoft.com>

We do ensure at least one string is present though, otherwise conflicts arise

This fixes a slight regression when parsing a preproc function definition using division operators

`a *= b != c ? d : e;` is parsed incorrectly as a result

This reverts commit eb6649e0c2.

Previously, pointers were associated with the function identifier, now they're associated with the return type

This resolves conflicts with declarations that can be interpreted as binary_expressions

* feat: allow identifiers in string concatenations

Resolves errors in strings of the form:

   ("failed in line %" PRIdLINENR)

---------

Co-authored-by: Lewis Russell <lewis6991@gmail.com>