Bug 19254 – Change exception output format to be "file link" friendly

Currently DMD outputs exceptions with a file path that looks like: core.exception.AssertError@tests/optional.d(450): unittest failure Since @ and dot are valid filename chars, there's no way for generic IDEs to and terminal plugins to "linkify" output without specific dmd exception knowledge. Maybe change to: tests/optional.d(450): [email protected]: assert message This will also match the error format: tests/optional.d(447,9): Error: error message

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