Add support arm64 architecture.

[r-plus]

Fixes #303

Summary of changes

• refactor assembly code for x86_64 #352
• fix arm64 architecture related issues (assembly code, rd_route and codesign)
• add Rosetta and CPU information to xvim info on "About XVim" form.
• fix already broken unit test case.
• refactor something.

[r-plus]

In my test, this is stable. Can anyone review this?

[mironal]

thanks!!!!!!!