Creates a standardized control to pick multiple columns, like SoftadminGuide.FieldStandard_Columns_Create, but with "=" or "LIKE" operators added.
This is useful when selecting columns for a WHERE-search. To see it in action, look at the "Search, New, Edit, Delete"-guide.
Expects a table #SoftadminGuideMultiControl created by SoftadminGuide.Field_MultiControl_Definition.