Cleanup of main and optimizer initializations

[nwittler]

What
General cleanup of the script based infrastructure.

Why
There was a lot of baggage from rigid old scripts. To make the software as a whole more extendable and usable, this needed to be cleaned up.

How
Moved relevant code from c3.utils.parsers.py to the respective initialization methods or c3.main.py

Open Questions

• In calibration (C2) and model learning (C3) the configuration files and therefore the interface should be discussed
• In particular the handling of C2 communication with the experiment (simulated or real)

[lgtm-com]

This pull request introduces 4 alerts and fixes 9 when merging b833c13 into 6e7e7a0 - view on LGTM.com

new alerts:

• 2 for Unused local variable
• 2 for Modification of parameter with default

fixed alerts:

• 6 for Unused local variable
• 2 for Wrong name for an argument in a class instantiation
• 1 for Unused import

[codecov-commenter]

Codecov Report

Merging #98 (13292a4) into dev (8e747d5) will increase coverage by 5.83%.
The diff coverage is 60.40%.

@@            Coverage Diff             @@
##              dev      #98      +/-   ##
==========================================
+ Coverage   51.48%   57.32%   +5.83%     
==========================================
  Files          36       35       -1     
  Lines        5409     5279     -130     
==========================================
+ Hits         2785     3026     +241     
+ Misses       2624     2253     -371     

Impacted Files	Coverage Δ
c3/main.py	55.17% <56.41%> (+55.17%)	⬆️
c3/optimizers/c1.py	72.72% <58.82%> (-8.44%)	⬇️
c3/optimizers/c3.py	19.47% <59.37%> (+19.47%)	⬆️
c3/optimizers/sensitivity.py	30.96% <59.37%> (+30.96%)	⬆️
c3/optimizers/c2.py	32.30% <66.66%> (+32.30%)	⬆️
c3/utils/utils.py	65.04% <80.00%> (+0.40%)	⬆️
c3/experiment.py	62.14% <100.00%> (+3.50%)	⬆️
c3/qiskit/c3_backend.py	78.80% <100.00%> (ø)
c3/system/chip.py
c3/system/model.py
... and 14 more

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[lgtm-com]

This pull request fixes 9 alerts when merging dce7007 into 6e7e7a0 - view on LGTM.com

fixed alerts:

• 6 for Unused local variable
• 2 for Wrong name for an argument in a class instantiation
• 1 for Unused import

[lazyoracle]

Ready to merge! 🚀

[nwittler]

This should be the location of the config file not the cfg dict.

[fedroy]

Just went thorugh it with @nwittler, up to hotfix of the storing the right config in main.py, the code is good for merging.

[lazyoracle]

[lgtm-com]

This pull request fixes 9 alerts when merging 13292a4 into e10518e - view on LGTM.com

fixed alerts:

• 6 for Unused local variable
• 2 for Wrong name for an argument in a class instantiation
• 1 for Unused import