Allow Frozen Columns

[ibrahimGit123]

The newest version of Serenity no longer support Slickgrid Frozen columns. It would be great if this feature was brought back.

[vooba]

Frozen Columns are working with v6.5.1

protected getSlickOptions() {
        let opt = super.getSlickOptions();
        opt.layoutEngine = new FrozenLayout();
        opt.frozenColumns = 1;
        return opt;
    } 

[ibrahimGit123]

I do see that, but doing this causes incompatibility issues when combined with Totals (CustomSummaryMixin), where the totals don't work properly