refactor: Move `Tox_Options` to `tox_options.h`. #6383

Job	Run time
docker-bootstrap-node	1m 10s
docker-clusterfuzz	33s
docker-esp32	1m 54s
docker-fuzzer	17s
docker-toxcore-js	1m 57s
docker-windows-mingw (32)	3m 46s
docker-windows-mingw (64)	3m 45s
docker-bootstrap-node-websocket	13s
	13m 35s

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