FEXCore: Move to Externals/FEXCore

Readme.md

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-# FEXCore - Fast x86 Core emulation library
-This is the core emulation library that is used for the FEX emulator project.
-This project aims to provide a fast and functional x86-64 emulation library that can meet and surpass other x86-64 emulation libraries.
-### Goals
-* Be as fast as possible, beating and exceeding current options for x86-64 emulation
-  * 25% - 50% lower performance than native code would be desired target
-  * Use an IR to efficiently translate x86-64 to our host architecture
-  * Support a tiered recompiler to allow for fast runtime performance
-  * Support offline compilation and offline tooling for inspection and performance analysis
-  * Support threaded emulation. Including emulating x86-64's strong memory model on weak memory model architectures
-* Support a significant portion of the x86-64 instruction space.
-  * Including MMX, SSE, SSE2, SSE3, SSSE3, and SSE4*
-* Support fallback routines for uncommonly used x86-64 instructions
-  * Including x87 and 3DNow!
-* Only support userspace emulation.
-  * All x86-64 instructions run as if they are under CPL-3(userland) security layer
-* Minimal Linux Syscall emulation for testing purposes
-* Portable library implementation in order to support easy integration in to applications
-### Target Host Architecture
-The target host architecture for this library is AArch64. Specifically the ARMv8.1 version or newer.
-The CPU IR is designed with AArch64 in mind but there is a desire to run the recompiled code on other architectures as well.
-Multiple architecture support is desired for easier bringup and debugging, performance isn't as much of a priority there (ex. x86-64(guest) translated to x86-64(host))
-### Not currently goals but will be in the future
-* 32bit x86 support
-  * This will be a desire in the future, but to lower the amount of work required, decided to push this off for now.
-* Integration in to WINE
-* Later generation of x86-64 instruction sets
-  * Including AVX, F16C, XOP, FMA, AVX2, etc
-### Not desired
-* Kernel space emulation
-* CPL0-2 emulation
-* Real Mode, Protected Mode, Virtual-8086 Mode, System Management Mode
-* IRQs
-* SVM
-* "Cycle Accurate" emulation
-### Dependencies
- * [SonicUtils](https://github.com/Sonicadvance1/SonicUtils)
- * LLVM
- * clang-tidy if you want to ensure the code stays tidy
- * cmake
- * A C++17 compliant compiler (There are assumptions made about using Clang and LTO)