Add Hide/Show functionality for Free Text Custom & System fields in the Issue Navigator

Free Text fields that are included in the Issue Navigator can have very large multiline values. These can be shown/hidden in the Display Issue page and we should add the same functionality to the Issue Navigator where space is at an even greater premium.

To implement this, we need to copy the "view-textarea.vm" AND include support for individual row identifiers (issue id) on the divs. Then, add these as "column-view" resources in the correct *-customfieldtypes-plugin.xml

For the System fields (Description and Environment) you need to change the *-columnview.vm the same way you did for the custom fields.