Customizable QSO entry fields, and "Save and Next" button

[xylo04]

For use cases like contesting and SOTA/POTA, operators are focused on just a few QSO entry fields, and need to be able to quickly and repetitively enter similar QSOs. For these cases, there should be a subset of visible fields relevant to the event at hand, there should be an additional Save button that goes directly to a new entry, and the new entry should copy most fields like frequency and signal report from the previously saved QSO.

Suggested by Devin KN6PHZ.