Lazy update of sort/group settings in table settings dialog

[stockbal]

Due to the immediate update of the underlying model it is currently not really possible to select a value in the dropdown control with the arrow keys or even via autocomplete. At least not properly.
This happens because if the dropdown control registers a selection change the fired event updates the model and the model triggers an immediate UI update in turn.

see https://github.com/stockbal/quick-data-reporter/blob/85fd5fa00b0869d08491188c5426acabe1e1b202/dev/helper/EntityTableSettings.ts