Stock Campaign Improvements

TSH v4 provides three elements of improvement to the stock campaign. The first is that missions involving a FAC previously caused a CTD (crash to desktop) if the missions were flown in Windows XP. The cause of this crash has been identified and the relevant missions have been edited to eliminate the crash.

In addition, all of the outdated screenshot briefing images for the stock campaign missions have been replaced with images of real military operations, for an added sense of immersion. Finally, briefing text for all missions has been slightly edited for grammar and punctuation.