~hannes/elma

Use is_empty to check if a password was supplied
Fix version number in man page
Bump version to 1.1.0
Allow setting the current scene transition
Allow setting the transition duration
Update version to 1.0.0
License the program under the terms of the AGPL 3
Overall improvements

- getopt argument parsing
- improved error handling
- more OBS version information
Fix setting preview scene
Remove unnecessary to_string call
Reduce the amount of dependencies a tiny bit
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