Support hooking ARM64EC target functions

[RatinCN]

Hi, Detours maintainers,

I'm the maintainer of KNSoft.SlimDetours, a leading fork of Detours with several important stability and compatibility improvements.

I first implemented ARM64EC compatibility in KNSoft.SlimDetours:

• KNSoft.SlimDetours PR #30
• TechWiki: Implement ARM64EC Compatibility

This PR ports that implementation back to Detours.

Summary

• ARM64EC builds detect whether each hook target uses x64 or ARM64EC code and use the corresponding instruction, trampoline, and patch handling.
• ARM64EC trampolines are allocated as EC code when required.
• x64 builds return ERROR_NOT_SUPPORTED when the hook target uses ARM64EC code.

Validation

Tested before and after this change on the same native ARM64 machine running Windows on ARM64.

Test	Before	This PR
Official unit tests: x86	Pass: 17 test cases, 132 assertions	Pass: 17 test cases, 132 assertions
Official unit tests: x64	Pass: 17 test cases, 132 assertions	Pass: 17 test cases, 132 assertions
Official unit tests: ARM64EC	Pass: 17 test cases, 132 assertions	Pass: 17 test cases, 132 assertions
Official unit tests: ARM64	Pass: 17 test cases, 132 assertions	Pass: 17 test cases, 132 assertions
samples/commem: x64	Crash (STATUS_ILLEGAL_INSTRUCTION)	ERROR_NOT_SUPPORTED; no crash
samples/commem: ARM64EC	Crash (STATUS_ILLEGAL_INSTRUCTION)	Pass

The ARM64EC build was also verified with both x64 and ARM64EC hook targets, including attach, trampoline invocation, detour invocation, detach, and restoration of the original function.

The previous commem crash is also reported in #292.

Acknowledgements

Porting the ARM64EC compatibility work from KNSoft.SlimDetours to Detours was assisted by OpenAI Codex.

Related to #292.