Log NVDA app architecture at startup (#16528)
Closes #16432
Summary of the issue:
NVDA does not log its own app architecture at startup.
Description of user facing changes
NVDA's app architecture will be logged as part of the log at startup.
Description of development approach
At startup, log os.environ["PROCESSOR_ARCHITECTURE"], useful if running NVDA on 64-bit systems and to prepare for #16304 work.
