Shinyngs/staticdifferential

[pinin4fjords]

Just a simple module wrapper for https://github.com/pinin4fjords/shinyngs/blob/develop/exec/differential_plots.R, useful for making differential plots in differential analysis workflows. Right now it's just making volcano plots, but will be extended in future.

Notes;

• I've tried to adhere to the feedback given for related PRs (see Shinyngs/app #2315, Shinyngs/staticexploratory #2364)
• The matrix data provided in the second channel is not currently used in the command. But I believe it will be necessary for future differential plots that leverage expression data (rather than just differential statistics as volcano plots do), so I've added the input channel to facilitate that.

PR checklist

Closes #2398

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[jfy133]

mostly LGTM but needs to remove the presumeed meta information from the module

[jfy133]

Once you've dropped the meta fields then LGTM

[pinin4fjords]

Thanks @jfy133 for review, hopefully I fully addressed your points in that final commit. I'll also look into submitting the analogous fix on deseq2/differential.