Generate custom content files for all plots, not just tables

[drpatelh]

Would it be possible to add the section anchor or id to name the custom content files in multiqc_data/

e.g. mqc_mqc_mplplot_kgrbwiulmq_1.txt could use this and be called mqc_mqc_mplplot_ivar_variants.txt instead.

[drpatelh]

Having played with this a little more it seems that custom content files are not saved to multiqc_data/ by default. I was wondering for the longest minute until I had a light bulb moment as to why I couldn't suddenly see them anymore. Basically, I removed export_plots: true from my config file. Would it be too painful to have these saved even if export_plots: false?

[ewels]

No, I have thought previously that it wouldn't be too bad to always dump plot data to text files..