Support diffs of UTF-16 encoded text files

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Summary

This is a follow up to gitlab-ce#10745

I created a sample project on gitlab.com that demonstrates this issue, see https://gitlab.com/j-steinblock/utf16-test and added a simple utf-16 file with the content

[List description]
[Description]
 Text=Something else
 FileVersion=10
 RootTable=MyTable
 Units=SCM-Units
 Metric=3

The file starts with FF FE 5B 00 (Hex Code)

Preview for this file is not possible, see: https://gitlab.com/j-steinblock/utf16-test/blob/master/test.txt (Edit link is missing as well)

A merge request just shows no preview for this file type, see: j-steinblock/utf16-test!1 (diffs)

Same for compare, see: j-steinblock/utf16-test@master...test