Robustify configurable, more options for testrun and contrib changes

[boeddeker]

No description provided.

[codecov-commenter]

Codecov Report

Merging #138 (b954fae) into master (e2d198c) will decrease coverage by 0.12%.
The diff coverage is 57.89%.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
- Coverage   77.26%   77.13%   -0.13%     
==========================================
  Files          46       46              
  Lines        3713     3727      +14     
==========================================
+ Hits         2869     2875       +6     
- Misses        844      852       +8     

Impacted Files	Coverage Δ
padertorch/train/trainer.py	80.92% <ø> (ø)
padertorch/configurable.py	79.79% <57.14%> (-0.66%)	⬇️
padertorch/train/runtime_tests.py	89.22% <60.00%> (-1.03%)	⬇️

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