Add padding to full screen, single pane lists on large displays

Just temporary until we figure out a better design that doesn't use
single pane lists in the same way.
Rework of ship deletion/management

Removed long press deletion, in favor of simple ship selection.

A few bugs/issues remain:
* "Clear upgrade slot" should become "ABANDON SHIP" when used for
        ship deletion.
* Should prioritize generic / unique version in ship swap list
* Should clear list fragment in two pane mode correctly
* Should move special action (clear) list item to separate
        View/adapter type for simplicity (may no longer need ship
        placeholder in that case