Revert "Core: Remove the MersenneTwiser-library (SFMT is now considered stable enough for full deployment)"

This reverts commit 6afaed4a02ff5e29510a9e1afffea803e02f3d69.

Conflicts:
	cmake/compiler/gcc/settings.cmake
	cmake/showoptions.cmake
	src/server/shared/Utilities/Util.cpp

Revert 6afaed4a02ff5e29510a9e1afffea803e02f3d69