Implementation of opt related classes

[97gamjak]

The optimization feature is still not ready - not even the most simplest case.

But however a lot of refactoring was necessary, therefore updating at least the dev branch.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 61.41479% with 240 lines in your changes missing coverage. Please review.

Project coverage is 78.42%. Comparing base (5bb349c) to head (8a9631b). Report is 2 commits behind head on dev.

Files	Patch %	Lines
src/setup/optimizerSetup.cpp	0.00%	57 Missing :warning:
src/simulationBox/simulationBox.cpp	61.72%	31 Missing :warning:
src/setup/qmmmSetup.cpp	0.00%	24 Missing :warning:
src/opt/evaluator/evaluator.cpp	0.00%	18 Missing :warning:
src/settings/settings.cpp	72.72%	14 Missing and 4 partials :warning:
src/setup/qmSetup.cpp	64.28%	12 Missing and 3 partials :warning:
src/engine/optEngine.cpp	0.00%	12 Missing :warning:
src/physicalData/physicalData_standardMethods.cpp	90.62%	12 Missing :warning:
src/settings/optimizerSettings.cpp	71.87%	9 Missing :warning:
src/opt/evaluator/mmEvaluator.cpp	0.00%	7 Missing :warning:
... and 14 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #62 +/- ## ========================================== - Coverage 79.66% 78.42% -1.25% ========================================== Files 283 298 +15 Lines 8463 8731 +268 Branches 3113 3242 +129 ========================================== + Hits 6742 6847 +105 - Misses 1692 1851 +159 - Partials 29 33 +4 ```

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