Add soft wrap option to txt file viewing
### Description Soft wrapping for the *editor* was [recently added](gitlab-ce!6188). It seems that it should be even simpler to have soft wrapping for simply *viewing* `.txt` files and similar. This would obviate (render unnecessary) sideways scrolling hassles for reading a text file. ### Proposal Add "soft wrapping" for the file viewer as an option. (Possibly make it the default—but if so, the current behavior should *definitely* be retained as an option.) ### Links / references gitlab-ce!6188 (I don't have any ready examples of *public* `.txt` files that have long lines; most public `.txt` files have *hard* wrapping.)
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