Add ARM64 platform support and define RAPIDJSON_ENDIAN for Windows ARM64

[jdavidson89]

This PR adds ARM64 platform support for RAIntegration.

Changes included:

• Added ARM64 configuration to the solution and project files
• Updated the VC toolset for the ARM64 configuration to the latest(v145)
• Added RAPIDJSON_ENDIAN=RAPIDJSON_LITTLEENDIAN to fix endianness detection
• Verified successful build on Windows ARM64
  Note: This PR does not modify Win32 or x64 configurations. All changes are isolated to the new ARM64 platform.

[jdavidson89]

The build is successful and executes correctly when applying my changes to the source tree, when building my fork the build is 1 kb smaller and doesn't have proper versioning info so builds successfully but fails to execute.

[Jamiras]

What is the goal state for this? Are you planning to make an ARM64 build of RALibretro or another emulator to consume it?

[Jamiras]

VS2026 has only been out for a couple weeks and I haven't upgraded yet. I don't know if the CI builds will support it either. Please leave these as v143.

[Jamiras]

Please update the logic in RA_Version.rc so the properties dialog will properly report the DLL as ARM64.

RAIntegration/src/RA_Version.rc

Lines 11 to 17 in 02dd50e

	#ifdef _WIN64
	#define RA_INTEGRATION_VERSION_PRODUCT_ARCH RA_INTEGRATION_VERSION_PRODUCT " (x64)"
	#define RA_INTEGRATION_ORIGINAL_FILENAME "RA_Integration-x64.dll"
	#else
	#define RA_INTEGRATION_VERSION_PRODUCT_ARCH RA_INTEGRATION_VERSION_PRODUCT " (x86)"
	#define RA_INTEGRATION_ORIGINAL_FILENAME "RA_Integration.dll"
	#endif

[Jamiras]

Just a few lines up from here, please update the logic to set the TargetName to RA_Integration-ARM64.

[jdavidson89]

I will check these changes out when I next get a chance to, I can also revert to v143 that was simply as that was the toolset I had installed I will reupload and yes I have working builds of rasnes9x and rapplewin and am working at porting more over as well, just submitting so you can add a working architecture to your codebase if you so wish to but I will clean it up accordingly. Thank you for your feedback.