Draft: Resolve "AR/VR Support via OpenXR"

Closes #143

modules/camera/config/OPEN_XR_SDK.cmake

+
+use_git_submodule("${vkcv_camera_lib_path}/OpenXR-SDK" open_xr_status)
+
+if (${open_xr_status})
+	list(APPEND vkcv_camera_includes ${vkcv_camera_lib}/OpenXR-SDK/include)
+
+  add_subdirectory(${vkcv_camera_lib}/OpenXR-SDK)
+	
+	list(APPEND vkcv_camera_definitions XR_USE_GRAPHICS_API_VULKAN)
+endif ()