Improve error handling in NotEye versions
The error handling in the ADOM versions with NotEye integration is not really helpful right now: while the Windows and Linux version log the error message to the "shell", the OSX version doesn't (since no shell is opened). This makes it very difficult/impossible to report the error message.
Therefore the NotEye versions now display the error message inside the game window. Additionally the adom.err file is now created inside the "adom.data" directory instead of the current directory, so it should be easier to locate.