Make addRemoveFieldsMarksDirty to respect .ays-ignore

[sb-relaxt-at]

If addRemoveFieldsMarksDirty is set to true, it might be nice to ignore added fields, that are marked either by applying the ays-ignore class or by setting a data attribute.

From my understanding it should be sufficient to filter the fields in line 91. As workaround one can also modify the field selector by adding ":not(.ays-ignore)".