Blacklist to speedUp airport loading

[data63]

since the newer builds take considerable time to read all the bgl's scanning for airports would it be an idea to allow the user setting up a "blacklist" (textfile) with all scenery directories not containing airports (Mesh, landclass, lot's of the ORBX thingies)
Could save.time and prevent those OOMs

Happy Landings and carry on your great work!!