Support dynamic data refresh for Scheduled Jobs

[AFaust]

FEATURE / ENHANCEMENT

The Scheduled Jobs tool should support reloading its data dynamically without requiring a full page reload and keeping the current sort ordering in place. Though most data for registered jobs is first, previous and next trigger times may change, and #113 is bound to introduce trigger state data (i.e. "normal", "pause"...) which may change, partially based on user actions.