* [Framework] Add a DateTime property for CarrierJumpRequest DepartureTime (#119)
Refactored out the logic backing the JournalBase TimestampDateTime property so it can be used for any DateTime type property, providing a standardized json String -> DateTime conversion for any date-time property. Implemented as an `internal static` method on JournalBase so journal objects which inherit from JournalBase or don't inherit from it can use it.
Used this to provide a DepatureTimeDateTime on CarrierJumpRequest (this property was added in Update 14) and to implement the existing ExpiryDateTime on CurrentGoal.
From a quick search in the journal documentation, I don't see any other applications for this.
* [ObservatoryCore] UI tweaks
Polishing a few rough edges:
* Enable scrolling on the Plugin List view. It only fit 6 or 7. I have 13.
* I fiddled a bit with column auto-sizing (left it commented out, see comment).
* A whole bunch of tweaks to the settings view:
* first row of controls was cut off at the top (under the window title bar)
* fixing that revealed uneven spacing between columns
* action buttons were teensy tiny and unreadable
* settings view columns were too narrow (200 px).
* added some spacing to help with readability
* settings windows now start in center of current screen rather than some random place.
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