Scaden

* fixed Dockerfile (switched to pip installation)
* added better error messages to `simulate` command
* cleaned up dependencies

* added `--seed` parameter to allow reproducible Scaden runs
* added `scaden simulate` command to perform bulk simulation and training file creation
* changed CLI calling

* fixed dependencies (added python>=3.6 requirement)

* upgrade to tf2
* cleaned up dependencies

* small code refactoring
* RAM usage improvement

* added automatic removal of duplicate genes
* changed name of prediction file