Apple M1: Build, Analytics, and Memory Management

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

Source/Core/Core/DolphinAnalytics.cpp

@@ -277,8 +277,7 @@ void DolphinAnalytics::MakeBaseBuilder()
   builder.AddData("android-version", s_get_val_func("DEVICE_OS"));
 #elif defined(__APPLE__)
   builder.AddData("os-type", "osx");
-//objc_msgSend is only available on x86
-#ifndef _M_ARM_64
+
   // id processInfo = [NSProcessInfo processInfo]
   id processInfo = reinterpret_cast<id (*)(Class, SEL)>(objc_msgSend)(
       objc_getClass("NSProcessInfo"), sel_getUid("processInfo"));
@@ -290,17 +289,21 @@ void DolphinAnalytics::MakeBaseBuilder()
       s64 minor_version;  // NSInteger minorVersion
       s64 patch_version;  // NSInteger patchVersion
     };
-
+    // Under arm64, we need to call objc_msgSend to recieve a struct.
+    // On x86_64, we need to explicitly call objc_msgSend_stret for a struct.
+#if _M_ARM_64
+#define msgSend objc_msgSend
+#else
+#define msgSend objc_msgSend_stret
+#endif
     // NSOperatingSystemVersion version = [processInfo operatingSystemVersion]
-    OSVersion version = reinterpret_cast<OSVersion (*)(id, SEL)>(objc_msgSend_stret)(
+    OSVersion version = reinterpret_cast<OSVersion (*)(id, SEL)>(msgSend)(
         processInfo, sel_getUid("operatingSystemVersion"));
-
+#undef msgSend
     builder.AddData("osx-ver-major", version.major_version);
     builder.AddData("osx-ver-minor", version.minor_version);
     builder.AddData("osx-ver-bugfix", version.patch_version);
   }
-#endif
-
 #elif defined(__linux__)
   builder.AddData("os-type", "linux");
 #elif defined(__FreeBSD__)