Basic unified data syntax implementation #388
                
     Merged
            
            
          
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Provides an (untested) first attempt at the UDS described in #365. This is by no means a final version, but I think the changes form a good, coherent base to continue working with. Currently, UDS is a separate data type for testing purposes.
My next step will be to experiment with creating the editor from #366.
This PR also updates a whole bunch of dependencies.