A view column in which the terminal should be shown in the editor area.
The default is the active. Columns that do not exist
will be created as needed up to the maximum of ViewColumn.Nine.
Use ViewColumn.Beside to open the editor to the side of the currently
active one.
An optional flag that when true will stop the Terminal from taking focus.
Assumes a TerminalLocation of editor and allows specifying a ViewColumn and preserveFocus property