Change filename format in build errors for better editor support

[alexkuz]

Right now, errors emitted by CRA look like this:

Since there's no line/column number appended to filename, there's no convenient way to locate an error by clicking on it (if terminal supports opening files on click, like iTerm). So it would be nice to have an error location in <filename>:<row>:<col> format (which I believe most of the editors support).

(also, see PR resolving the same issue in TSLint: palantir/tslint#3491)

[iansu]

There is an open PR to address this issue: #5624

[alexkuz]

Missed that, thanks!

[stale]

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