Advertise repeat capability via FEAT1 flags #196

Job	Run time
build (RAK_4631_room_server)	2m 25s
build (RAK_4631_repeater)	2m 19s
build (Heltec_v3_companion_radio_ble)	2m 44s
build (Heltec_v3_room_server)	2m 57s
build (RAK_4631_companion_radio_ble)	2m 29s
build (Heltec_v3_repeater)	3m 0s
build (wio-e5-mini_repeater)	1m 51s
build (PicoW_repeater)	2m 34s
build (LilyGo_Tlora_C6_repeater_)	1m 58s
	22m 17s

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