release Isdir Stromgarde keep 1.0

Yes i know, there were so many similar works on the restoration of the fortress, but only one was completed. I did my own version of this project in my spare time, it's made in "classic" style. You can download it and try it yourself, it's not the final release, I still have to do a bit more work with details. If you find some problems and deficiencies, please write about it.