generate next matches, some fixes;
generate next matches, some fixes;

- looks for already played matches
- only possible to play all combinations once
- keeps played matches differences in the same poule to only 1
- watches for already generated matches while generating matches

TODO: use the algoritm of https://github.com/FredFlitsPaal/SharpShuttle to generate these matches

FredFlitsPaal/ISBTsoftwareSBHelios,FredFlitsPaal/ISBTsoftwareSBHelios,FredFlitsPaal/ISBTsoftwareSBHelios