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	After a report by @eschbach the random functions are still not available under windows

[ADD #591] Replaced std::random_shuffle with std::shuffle, which should also be available under MacOSX and Windows.
		std::random_shuffle is also outdated since c++14
		https://en.cppreference.com/w/cpp/algorithm/random_shuffle

[FIX #566] Remove forward declaration of WSelectionManager and WPickInfo, so that llvm can compile these files

# Conflicts:
#   src/modules/pointConnector/WMPointConnector.cpp