updated folder structure

trying to prevent so many changes appearing in commit log by preventing
files from having to be moved around; archive and current PBO folders
have been merged; as a general rule, try to work off of the same
unpacked PBO folder rather than deleting and creating a new one; if
wanting to start with fresh code, take note of the name of unpacked
folder, delete current unpacked folder, unpack most recent PBO, move to
working folder, then rename to original name of unpacked folder (from
here on we'll name "dayz_mission" and "dayz_server"); this will prevent
from 100s of files showing up in a commit log because the name of their
root directory changed