Rename "new_sgserializable" to "create"

[lisitsyn]

No description provided.

[karlnapf]

Not sure "create" is the best name, but definitely better than the one before +1

[lisitsyn]

I am open for suggestions ;)

[karlnapf]

Instantiate?

[codecov]

Codecov Report

Merging #3905 into develop will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #3905      +/-   ##
===========================================
- Coverage    53.29%   53.24%   -0.05%     
===========================================
  Files         1432     1432              
  Lines       104427   104427              
===========================================
- Hits         55653    55602      -51     
- Misses       48774    48825      +51

Impacted Files	Coverage Δ
src/shogun/base/Parameter.cpp	55.33% <100%> (ø)	⬆️
src/shogun/base/SGObject.cpp	74.45% <100%> (+0.27%)	⬆️
src/gpl/shogun/lib/external/libqp_gsmo.cpp	19.73% <0%> (-65.79%)	⬇️
...g/kernelselection/internals/OptimizationSolver.cpp	87.71% <0%> (-5.27%)	⬇️
src/shogun/distance/BrayCurtisDistance.cpp	96.55% <0%> (-3.45%)	⬇️
src/shogun/machine/KernelMachine.cpp	78.91% <0%> (-0.32%)	⬇️
src/shogun/lib/external/shogun_libsvm.cpp	64.32% <0%> (+0.14%)	⬆️
src/shogun/distance/CosineDistance.cpp	100% <0%> (+2.85%)	⬆️

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