LinalgRefactor - Drop legacy linalg codes

[OXPHOS]

No description provided.

[codecov]

Codecov Report

Merging #3936 into develop will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3936      +/-   ##
===========================================
+ Coverage    54.08%    54.1%   +0.01%     
===========================================
  Files         1441     1441              
  Lines       105070   105070              
===========================================
+ Hits         56824    56845      +21     
+ Misses       48246    48225      -21

Impacted Files	Coverage Δ
src/shogun/kernel/ExponentialARDKernel.cpp	84.72% <ø> (ø)	⬆️
src/shogun/multiclass/tree/CARTree.cpp	89.37% <ø> (ø)	⬆️
src/shogun/distance/BrayCurtisDistance.cpp	96.55% <0%> (-3.45%)	⬇️
src/shogun/distance/CosineDistance.cpp	97.14% <0%> (-2.86%)	⬇️
src/shogun/lib/external/shogun_libsvm.cpp	63.87% <0%> (-2.29%)	⬇️
src/shogun/optimization/liblinear/tron.cpp	86.61% <0%> (-0.71%)	⬇️
src/shogun/machine/KernelMachine.cpp	79.03% <0%> (ø)	⬆️
...g/kernelselection/internals/OptimizationSolver.cpp	92.98% <0%> (+8.77%)	⬆️
src/gpl/shogun/lib/external/libqp_gsmo.cpp	85.52% <0%> (+65.78%)	⬆️

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[karlnapf]

Nice!
We should also delete the old wiki page. Wanna do that?

[OXPHOS]

Sure! I'll get the new version ready ASAP