Improve CAM Frontend

[gaurav]

This PR implements a number of improvements to the CAM-KP Frontend:

• Reversed predicates should now be removed: any "reversed" predicate is reversed during loading, and duplicate predicates are removed.
• Added support for filtering search by model URL, allowing you to select a particular kind of model (e.g. CTD).
• We now AND subject-or-object searches instead of OR-ing them.
• Improved display of search results (which still don't make a heck of a lot of sense, but are better than they were previously).
• The "Edges" table can now be exported as a CSV file.
• The "Edges" table now defaults to a minimum display, but additional information (such as description, information content and equivalent identifiers) can be toggled on if needed.
• Added a "Relationships" table showing all edges from one CURIE to another.
• Improved displayed messages, such as when no model has been loaded and "Download in progress" messages.
• Updated query to Neo4J 5 (which requires properties(edge) to get the properties for an edge).
• Software code improvements, such as getting rid of the ListCAMs component and merging its contents into SearchCAMs and improved DisplayCAM organization.
• Added a shared method for mapping a URL to a CURIE.