Add disable-filter option to columns

[nomego]

When designing omnitable views that use backend searches, backend needs to implement available-values and filtering for each shown property.
To fast-track some view/API development, we want to postpone some filtering.
For this to make sense to users in the view, we need to disable filtering completely for the column and/or color the column/cells differently to make it clear that it will not affect the backend search.