merge

have engine try for a second position when map loading fails (in this way it's possible to move Missions data to any path) remove nsstringextra and implement raw dump when needed

further rework of MapConfigViewController, lists missions correctly (they don't load fine yet)

move all preview drawing code into its own class (for a simplified and more readable MapConfigViewController)

remove windspeed from bubbles, remove initial dY from bubbles, apply dY/dX to bubbles, correct offsets on flying saucer flame graphics, add bubbles when flying saucer thrusts underwater, make flying saucer sink more slowly underwater

Can't use cHealthDecrease here for these two 'cause it isn't a generic "do some damage to hog" flag, but is rather set when SD starts

Allow UFO to go underwater. Keep UFO active if it runs out of fuel in the air/water, just disable controls.