More flexible optimization framework

[tobiasbecher]

Started on a more flexible optimization problem framework that allows for easier integration of individual plan calculation methods like weighted sum, lexicographic optimization, etc., as well as tradeoff exploration strategies, like sandwich methods.

[wahln]

Some comments on the draft:

• is there a reason for the function name changes in the Problems?
• I am still not super convinced by the strategy separation. For example, a trade-off strategy using a scalarization strategy - wouldn't you run into troubles there? I guess a Sandwiching algorithm has very limited use for other salarization strategies than weighted sum. A lexicographic will redefine so much in each sequence that it probably doesn't make sense to rely on an existing scalarization strategy. I don't know if this forced interdependence is really necessary.
• what about the new_templates folder?
• The objective convexity and linearity is good. However, you discussed the issue of objectives being linear / convex sometimes based on their parameters. Do you want this to be dropped now?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 69.78131% with 152 lines in your changes missing coverage. Please review.

Please upload report for BASE (develop@45cc48b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...rategies/scalarization_strategies/_weighted_sum.py	46.66%	24 Missing ⚠️
...ation_strategies/_base_scalarization_strategies.py	59.18%	20 Missing ⚠️
pyRadPlan/dose/engines/_base_pencilbeam.py	0.00%	11 Missing ⚠️
pyRadPlan/optimization/problems/_optiprob.py	70.27%	11 Missing ⚠️
pyRadPlan/stf/generators/_factory.py	73.80%	11 Missing ⚠️
pyRadPlan/dose/engines/_base.py	16.66%	10 Missing ⚠️
...on/strategies/scalarization_strategies/_factory.py	61.53%	10 Missing ⚠️
...ization/strategies/tradeoff_strategies/_factory.py	61.53%	10 Missing ⚠️
...lan/optimization/problems/_simple_least_squares.py	0.00%	9 Missing ⚠️
...yRadPlan/dose/engines/_base_pencilbeam_particle.py	27.27%	8 Missing ⚠️
... and 9 more

Additional details and impacted files

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  Coverage           ?   64.79%           
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  Files              ?      102           
  Lines              ?     5377           
  Branches           ?        0           
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  Hits               ?     3484           
  Misses             ?     1893           
  Partials           ?        0           

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[philsuess]

I would like to see a class interaction diagram. I am not clear on the what the role of each scalarization_{method/strategies} and tradeoff_strategies are.