Improve compatibility of NVDA for Windows 10 on ARM64. (#7508)
* When running on Windows for ARM64, it is currently impossible for NVDA to inject in-process, therefore if we have not injected, support speak typed characters the same way we currently do for UWP apps (I.e. with ToUnicodeEx). Of course this is only possible on Windows 10 Creators update and above as ToUnicodeEx had a bug before that.
* ApModule.is64BitProcess: As well as AMD64, also detect ARM64. This allows NVDA's 64 bit specific code for SysListview32 etc to function on ARM64 when being emulated as x86.
