Discuss: Move `pvtUnused` list to separated component, detached from main table

[rturk]

Currently the list of unused componentes is rendered as part of the main table, as if was some sort of a row. This component is named pvtUnused

Overall this is unnecessary and somewhat confusing for users, since the list is placed as row, users often assume that unused variables can only be used in rows when in fact they are valid for both rows and columns. Current setup is also not very friendly in smaller devices.

My recommendation is to move the list of unused componentes to a separated list in the top of the table