Reduction of the use of rtemplate

[llaniewski]

This PR introduces a "Model" abstract class which provides all model related data.frames in C++ containers that are easy to iterate over. This allows for all Handlers, and some other parts of code to not rely on rtemplate code generation to function.

[codecov-commenter]

Codecov Report

Patch coverage: 43.25% and project coverage change: +0.21% 🎉

Comparison is base (826ebf4) 44.08% compared to head (a7659dc) 44.30%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #445      +/-   ##
===========================================
+ Coverage    44.08%   44.30%   +0.21%     
===========================================
  Files          166      169       +3     
  Lines         7821     7887      +66     
===========================================
+ Hits          3448     3494      +46     
- Misses        4373     4393      +20     

Flag	Coverage Δ
d2q9	30.38% <33.48%> (-0.17%)	⬇️
d2q9_bc	26.67% <25.38%> (-0.14%)	⬇️
d2q9_kuper	27.44% <30.98%> (-0.07%)	⬇️
d3q27_PSM_NEBB	36.00% <36.95%> (+0.28%)	⬆️
d3q27_pf_velocity	30.44% <36.73%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
src/Handlers/BSpline.cpp	0.00% <ø> (ø)
src/Handlers/IfContainer.cpp	0.00% <0.00%> (ø)
src/Handlers/IfContainer.h	0.00% <ø> (ø)
src/Handlers/OptimalControl.cpp	0.00% <0.00%> (ø)
src/Handlers/OptimalControlSecond.cpp	0.00% <0.00%> (ø)
src/Handlers/acObjective.cpp	0.00% <0.00%> (ø)
src/Handlers/acOptimize.cpp.Rt	26.66% <ø> (ø)
src/Handlers/acRunAction.cpp	0.00% <0.00%> (ø)
src/Handlers/acThreshold.cpp	0.00% <0.00%> (ø)
src/Handlers/acThresholdNow.cpp	0.00% <0.00%> (ø)
... and 31 more

... and 1 file with indirect coverage changes

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