Airpower OOB adjustments

[Scottgwalker83]

I've made numerous adjustments to aircraft and air-delivered weapons in the USA OOB. Some increase capability, some decrease it. My attached OOB notes also add some detail to how airpower functions in winSPWW2 that isn't in the manual or MOBHACK editor.

While SP is primarily a ground-based game engine that treats airpower as a modified form of artillery, it can be made to work reasonably well as long as the limitations are recognized.