Build a mission

To-Do
 * Where are mission files stored?
 * How to unpack dta to get original mission files
 * Note that sub-folders are allowed in Missions folder (http://www.hidden-and-dangerous.net/board/viewtopic.php?f=34&t=914)
 * Few sentences about scripting and how scripts are linked to objects. see here
 * DC||ED2 (separate page), Revended Editor download & First Steps
 * Checkpoints (3ds Max) (separate page)