Read input only once

[jdamanalo]

Close #238

Time

time for i in {1..5}; _build/release/bin/erlfmt -w 'otp/lib/*/{src,include}/*.{erl,hrl}'; done

Main
real 0m43.746s
user 1m51.063s
sys 0m39.859s

This
real 0m36.764s
user 1m35.922s
sys 0m34.750s

Potential incompatibility

Changed return of format_[file, file_range, string_full, string_range] to include the original. Type of formatted string from [unicode:chardata()] to string().

Possible alternative: Introduce new tag unchanged.

Question

Can format_file_range be removed?

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