Remove stat-specific code from pilot_canEquip

Since it was decided to allow players to create non-spaceworthy ships
in the equipment screen, this function no longer cares about stats,
only slot sizes and a handful of edge cases.
Add escorts when loading a game

This prevents the fighter bay from being reloaded with new fighters
when the current ones are still deployed in space.
Always restore the focused line in the keybinds list, if possible
Multiply displayed outfit price by the buy/sell modifier
Don't skip the rest of the loop when setting the ship's afterburner