Allow quick entry of new line into CSV from Show Properties screen

[asirota]

The main use case for this product is to add and edit existing entries to a config file. This use case allows adding new entries to the csv quickly from the show properties pop up screen.

The key issue is to show which functions can be made available based on the type of element being edited. The drop down should only show functions based on the type of element being inspected.

If a csv line item exists with the current element being inspected, watm should show an alert to the end user to let them know they will overwrite existing configuration. This will make it easy to enforce unique editing for each element as long as this user interface is used. This is Desired to avoid conflicts.

[asirota]

related to #58 as that issue describes a similar approach - should be consolidated together