Fixed NullPointerException & API-Change

[dennisfabri]

1. Handled a situation where a NullPointerException was occurring.
2. Made an API-Change to improve method signature

Further changes:

• Updated dependencies

[steos]

Thank you very much! It looks good to me and I would like to merge this but it seems like there have been formatting changes and code has been moved around in the JnaFileChooser class. Can we fix this to have a clean diff?

[jwcharp]

Any Ideas on how to preset the file name and extension on a SAVE dialog?

[jwcharp]

Hi have forked and added functionality to set the title of the dialog along with preset the default file name and tried to simplify the structure as much as possible.

[dennisfabri]

Sorry. I got distracted by other things. I will come back to this when I have the time.

[dennisfabri]

Now I reduced the changes to the real modifications with minimal modifications to the code.

[steos]

Very cool, thanks for your efforts!