SMC/Mtrack: Add mirrored memory support
Can be both in process and out of process, and both for shm and files

In process test case: https://github.com/FEX-Emu/fex-assorted-tests-bins/blob/main/src/smc-shared.cpp
Out of process test case: https://github.com/FEX-Emu/fex-assorted-tests-bins/blob/main/src/smc-shared-2.cpp