CMake: added option to select memory allocator

Слиты xottab-duty запросил слияние github/fork/vTurbine/build/mimalloc_opt в xd_dev

Created by: vTurbine

  • now memory allocator can be selected with MEMORY_ALLOCATOR CMake option. Valid values: mimalloc(default), tbb, standard
  • mimalloc tests and shared library are switched off