first pass for implementing missions/training selection on ipad (not yet running)

hm. probably should set both

Basic test implementation of an ice flag. Allows for slick parts of terrain. Intended for ice gun, or "ice" mask on portions of land objects. In this test variant it is triggered on girders/objects/bridges of the snow/christmas theme, or on a map that uses blue as a mask colour. Probably needs sheepluva's slope detection to make slopes more slippery to climb.

on ipad2 and above animate the little hogs on game config and fix the hat display imaging

little changes and fixes to the previous commit

headers cleanup, converted some function-only sources into proper class method files, more use of OOP power, removed some 'respondsToSelector' calls, moved defines into their own header, more use of objc categories

This prevents girders from erasing landbacktex (square windows in tunnels and such), at the cost of requiring lfBasic and lfObject to be treated the same apart from graphically

fix a couple of 'potential leaks'

rename the ios settings files into something more appropriate

ios major refactoring for ios settings, now they are presented differently on iphone/ipad, code is simplified and optimized, and ui is a little refreshed (eg. no more stuck selected fields)

infecting sheepluva's mission graphics with retina images

a little code cleanup