Exporting annotation type columns

[Nicklas Nordborg]

The table exporter for annotation types need to improve how values are exported. There are some values that need to be transformed:

• Value type: Is currently exported as an integer but it should be transformed to the values that are displayed in the GUI (but uppercase).
• Item types: Is currently not exported at all. Should be exported as a comma-separated list of item type names.
• Enumeration: Is currently exported as a boolean value but should export the actual enumeration values.