annotate: do not poorly split lines at CR (issue5798) mdiff and lines(text) take only LF as a line separator, but str.splitlines() breaks our assumption. Use mdiff.splitnewlines() consistently. It's hard to read \r in tests, so \r is replaced with [CR]. I had to wrap sed by a shell function to silence check-code warning.

templater: add option to parse template string just like raw string literal This seems a bit odd because the template syntax has no raw string literal containing template fragments, but is necessary to port filename format string to templater. See the next patch.