On Windows, application-specific settings are stored in the registry under HKCU\Console<path_to_app>.
Our implementation of conhost.exe does not know which process is connected to it, so we need to get the full process image name before loading any application-specific console settings.
To do this, we extend the server protocol to pass the process Id of the connected console process to conhost.exe.
Please run tools/make_requests before merging.
-- v3: conhost: Load application-specific settings using the full process image name server: Send console process ID via get_next_console_request()