Improvements and extensions

- Added a check if the configuration is accessible via FTP when checking
if it exists to make really sure no wrong actions are performed
- Fixed a bug that threw a "ArgumentException" when FTP-directory was
the root path
- Fixed a small security gap and memory leak
- Renamed some members of classes of external libraries
- Made directory searching half working (will be finished the next
day(s)
- Finished dialog for creating projects
- more...