[XAM/NUI] - Implement More Functions

- Implement XamNuiIsDeviceReady, XamNuiIdentityGetSessionId, XamNuiHudGetInitializeFlags, XamIsNuiUIActive, XamUserNuiGetUserIndexForSignin and XamNuiHudGetVersions
- Stub XamIsNuiAutomationEnabled/XamIsNatalPlaybackEnabled, XamUserNuiGetUserIndex, XamUserNuiEnableBiometric, XamNuiGetDepthCalibration, XamNuiSkeletonGetBestSkeletonIndex, XamNuiIsChatMicEnabled, XamNuiPlayerEngagementUpdate, XamNuiCameraTiltGetStatus, XamNuiCameraElevationGetAngle, XamNuiCameraGetTiltControllerType, XamNuiCameraSetFlags,  XamShowNuiGuideUI, XamNuiHudIsEnabled, XamNuiIdentityEnrollForSignIn , XamNuiIdentityAbort and XamNuiHudSetEngagedTrackingID
- According to Xam XamIsNuiAutomationEnabled, and XamIsNatalPlaybackEnabled are the same function.
- Left Notes for future reference

src/xenia/kernel/xam/xam_module.h

@@ -22,6 +22,7 @@ namespace kernel {
 namespace xam {
 
 bool xeXamIsUIActive();
+bool xeXamIsNuiUIActive();
 
 static constexpr std::string_view kXamModuleLoaderDataFileName =
     "launch_data.bin";