Create multiple topic categories from a single CSV file

[farling42]

Now that the contents information has been separated out from the structure information it should be possible to have multiple topic categories configured on the right-hand side in order to allow a single CSV file to produce more than one category's worth of information.

The simplest method is to have a "KEY" icon in the topic title which can be used to specify which column of the model should be used to match with a "fixed text" value to match in order for the CSV row to be used to generate a topic of that category.
(Present two combo boxes: the first combo-box lists the column titles; selecting a column will then populate the second combo box with all the unique values found in that column.)

The drop-down menu will also need to indicate (with a leading "*") which categories have been configured to have data generated from the CSV file.