ISA converter - use of default configuration - update needed to cope with new assay definitions

[proccaserra]

Symptoms:

Conversion from ISA-JSON to ISA-TAB drops unrecognized assays if measurement type and technology types not found in
/resources/config/json/default by the converter

• strict requirement on measurement type.term and technology type.term value: exact match needed.
• strict requirement on protocol_type.term value: exact match needed.
• strict requirement on the sequence of processes and input/output (no support for optional steps, e.g. optional Labeling events during sample processing

TODO:

• add set of assay configurations to cover Metabolights definitions:
  https://github.com/EBI-Metabolights/MtblsWS-Py/blob/master/resources/MetaboLightsAssayMaster.tsv
• catch unrecognised assay definitions (measurement type + technology type) and raise an ERROR to users and point to curation actions to take.
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