v1.6.4 - Internal Release

1.6.2 - uses mapall.txt instead of maplist.txt, which is already used.
1.6.3 - manually push stock maps onto list before writing file.
1.6.4 - Pull stock maps from maps/ dir, and custom maps from
download/maps/ dir. (Steampipe changed this.)

To Do: Fix sorting - stock maps at top.