Add option for preamble before shdo scripts #200
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I want all of my scripts to explicitly start in the current dirvish working
directory, so I use the example from the doc:
let g:dirvish_shdo_preamble = 'cd {}'
Other users may tend to create scripts with arguments, want their
commands to be inside a function, or output some diagnostic data.
Using the same escaping that is applied on lines since that seems like
the safest thing to do.