* Add end_col and end_lnum to ShellCheck
ShellCheck supports a JSON format mode which includes an 'endLine' and
'endColumn' field.
We must use the newer 'json1' format as it properly treats tabs as a
single character. 'json1' was not supported until v0.7.0 in 2019[1], so
we maintain support for the older GCC based format.
[1] https://github.com/koalaman/shellcheck/blob/v0.9.0/CHANGELOG.md?plain=1#L121
* Add wiki link to ShellCheck json output
Brandon Maier
Brandon Maier
Ian2020
w0rp