Copy allowable values from Swagger free text to node

[cherhaus]

Copy information about allowable values from free text descriptions to Swagger node "AllowableValues". Affected:

• Compound Classifications/tree
• Classification of Targets for Compound/tree
• All occurences of activity_relation
• Chemical Structure Search: Similarity/searchOptions.SimilarityType
• Chemical Structure Search: Similarity/commonOptions.Complexity
• Chemical Structure Search: Similarity/commonOptions.Isotopic
• Chemical Structure Search: Substructure/searchOptions.MolType
• Chemical Structure Search: Substructure/commonOptions.Complexity
• Chemical Structure Search: Substructure/commonOptions.Isotopic
• Chemical Structure Search: Exact/searchOptions.MatchType
• Chemical Structure Search: Exact/commonOptions.Complexity
• Chemical Structure Search: Exact/commonOptions.Isotopic
• Target Information (Batch)/drug_type
• All occurences of evidence in Tissue calls
• Hierarchies: Root Nodes/root
• All occurences of branch in Concept calls
• All occurences of _lens (it is known that lenses are still experimental. However, if accessible by the API, the parameter should also be documented)

[danidi]

I'm not sure about the activity_relation values here, as this would need to include all possible combinations of the relation values with the pipe symbol.