This commit adds support for compiling Dolphin for ARM on MacOS so that it can
run natively on the M1 processors without running through Rosseta2 emulation
providing a 30-50% performance speedup and less hitches from Rosseta2.

It consists of several key changes:

- Adding support for W^X allocation(MAP_JIT) for the ARM JIT
- Adding the machine context and config info to identify the M1 processor
- Additions to the build system and docs to support building universal binaries
- Adding code signing entitlements to access the MAP_JIT functionality
- Updating the MoltenVK libvulkan.dylib to a newer version with M1 support

Analytics:
- Incorporated fix to allow the full set of analytics that was recommended by
  spotlightishere

BuildMacOSUniversalBinary:
- The x86_64 slice for a universal binary is now built for 10.12
- The universal binary build script now can be configured though command line
  options instead of modifying the script itself.
- os.system calls were replaced with equivalent subprocess calls
- Formatting was reworked to be more PEP 8 compliant
- The script was refactored to make it more modular
- The com.apple.security.cs.disable-library-validation entitlement was removed

Memory Management:
- Changed the JITPageWrite*Execute*() functions to incorporate support for
  nesting

Other:
- Fixed several small lint errors
- Fixed doc and formatting mistakes
- Several small refactors to make things clearer

- Added MacOS version checking around MAP_JIT to prepare code for x86 MAP_JIT

Merges two nested #ifndefs into a single #if around hw cap includes.

- Fixed error that was causing the hardened runtime from being enabled
- Refactored BuildMacOSUniversalBinary.py based on code style recommendations

In MacOS 11.2 mprotect can no longer change the access protection settings of
pages that were previously marked as executable to anything but PROT_NONE. This
commit works around this new restriction by bypassing the mprotect based write
protection and instead relying on the write protection provided by MAP_JIT.

- Fixed a typo in the Readme.md
- Made the recursiveMergeBinaries function handle divergent binary file trees
  better.

- Enabled MAP_JIT on x86_64 after confirming that pthread_jit* calls are only
required for MAP_JIT pages on Apple Silicon

Added a Common::JITPageWriteDisableExecuteEnable() that could be missed when
a memory exception is triggered by the running game.

Removed the unavailable CPU core dialog box that asked users to change their
selected CPU core to one that is available. Instead, Dolphin now just overrides
the core to the default, and logs that it performed the override.

- Updated MoltenVK library in external to 1.2.170.0 (fixes swapchain crash)

- Removed -mssse3 flag from arm64 builds
- Removed -march=core2 from arm64 builds

This change adds the -G and --build_type arguments to the
BuildMacOSUniversalBinaray.py build script to allow the CMake generator and
build type to be specified for universal binary builds.

The defaults are:
-G "Unix Makefiles"
--build_type "Release"

1) Place information about universal builds after single architecture builds
   since universal builds are harder to setup the environment for.
2) Specify that new arguments should be provided instead of direct script
   modification for universal builds.

Modify the build script to use CMake's cross compilation infrastructure instead
of running CMake natively in x86_64 and arm64 mode to configure the two project
files. This should fix the builds with CMake executables installed through
homebrew and should pave the way for building universal binaries on x86_64
systems.

Incorporated changes suggested by Kode54 to use the CMake prefix path, instead
of relying on pkg-config directory paths.

Added the prefix paths from the other architectures build to the CMake ignore
path so that CMake doesn't pick up libraries from the wrong architecture if
they are in the user's search path.

This commit fixes a regression in 2ba88d5 that
would cause an app bundle to not be resigned after merging the two single
architecture builds.

Also, applies formatting suggestions from Leo Lam

Added RAII wrapper around the the JITPageWriteEnableExecuteDisable() and
JITPageWriteDisableExecuteEnable() to make it so that it is harder to forget to
pair the calls in all code branches as suggested by leoetlino.

Adds a step to detect when the Intel and arm64 build trees cannot be merged
safely. This can occur when each side has files/folders that are named the same
but are of different types or symlinks that are the same name but need to point
to different locations for each architecture.

Before this change, this would just fail silently.

Adds a new PlatformID for universal builds. This will allow single architecture
builds to be updated through the single architecture path, and universal builds
to be updated with universal builds.