Worksheet parameter override improvements

Worksheet Parameter Overrides are now listed on a separate tab to standard Parameters for standard and multi-panel worksheets and plan sheets. This is a further improvement to the worksheet parameter overrides extensibility added in a previous version.

This enhancement provides details of all parameter overrides to a worksheet or plansheet definition.

It specifically allows creating an override for a parameter which may not already be defined in the worksheet, which has not been previously possible. For example, introducing a filter, like hide zero rows (rv_hide_zero_left) on a standard worksheet in which, this worksheet parameter is not defined; or adding a chart type (rv_chart_type) to a worksheet which is not part of the standard content.

The override value continues to support the %default% and %empty% variables, allowing extensions to the default parameter values, or to override the standard parameter without passing a value.

Parameter Overrides are maintained when loading new versions of the standard content. Worksheet and Plansheet parameters overrides are included in the extension template, when exporting overrides, for migrating to another instance or tenant.