Commits on Dec 7, 2018

1. use top level fs functions where appropriate …

   This commit replaces many usages of `File::open` and reading or writing
   with `fs::read_to_string`, `fs::read` and `fs::write`. This reduces code
   complexity, and will improve performance for most reads, since the
   functions allocate the buffer to be the size of the file.
   
   I believe that this commit will not impact behavior in any way, so some
   matches will check the error kind in case the file was not valid UTF-8.
   Some of these cases may not actually care about the error.

   

   euclio committed Dec 7, 2018
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