Delete generated files by moban

[chfw]

Before raising the PR, here is a check list:

• have you written unit tests for your code changes?
• have you updated the change log?
• can someone else understand your changes without your explanation?
• are you proud of your code changes?
• please add your name and github link to contributors.rst in alphabetical order.

[codecov-commenter]

Codecov Report

Merging #381 into dev will decrease coverage by 0.02%.
The diff coverage is 94.36%.

@@            Coverage Diff             @@
##              dev     #381      +/-   ##
==========================================
- Coverage   96.05%   96.03%   -0.03%     
==========================================
  Files          55       56       +1     
  Lines        2868     2902      +34     
==========================================
+ Hits         2755     2787      +32     
- Misses        113      115       +2     

Impacted Files	Coverage Δ
moban/core/definitions.py	100.00% <ø> (ø)
moban/core/plugins.py	100.00% <ø> (ø)
moban/externals/file_system.py	94.38% <ø> (+0.95%)	⬆️
moban/plugins/delete.py	81.81% <81.81%> (ø)
moban/constants.py	100.00% <100.00%> (ø)
moban/core/moban_factory.py	98.14% <100.00%> (+0.04%)	⬆️
moban/core/mobanfile/store.py	100.00% <100.00%> (ø)
moban/core/mobanfile/targets.py	98.79% <100.00%> (+0.02%)	⬆️
moban/core/mobanfile/templates.py	100.00% <100.00%> (ø)
moban/externals/reporter.py	96.22% <100.00%> (+0.14%)	⬆️
... and 3 more

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