build windows / Visual Studio 2019

[ghost]

First attempt. 58 errors.

• add #include <tuple> in base.hpp (avoid non defined type in the cpp)
• add #include <algorithm> in gknv_crossings_reducer.cpp and sugiyama_digraph.cpp (avoid error on std::sort non defined)
• add = nullptr to Node* startNodeCopyGraph; in spqr_decomposition.cpp (line 122) and bctree.cpp (line 139) to avoid error C4703 on same files (respectively line 139 and line 157)

After that static build of library is ok with 185 warnings.

Not tested yet but seem a very good framework ! Thank you so much !