Update MetaboLights templates

[kdp-cloud]

• Extraction
• Chromatography
• Mass spectrometry
• NMR sample
• NMR spectroscopy
• NMR assay
• Data Transformation

[NielsGeudens]

I provided a number of comments on different attributes.
In general:

• we should decide to either use 'Normal case" or "Title Case"
• We should define a title attribute for each template
• Do we include 'Guard Column' and 'Autosampler Model'? This are optional in MetaboLights (but standardly included in the assay), though the description of these attributes mentions 'mandatory' (though there are not). Perhaps we should include them as optional?
• The attribute "Labelled Extract Name" is present in a few templates, but I think these should be deleted. The output attribute is defined separately in all cases anyway..