hci: extract hci_remote_sc_enabled

gap: reject pin code request if secure connections only mode is active

hci: delete unused authentication flags

hci: prefix authentication flags with AUTH_FLAG_*

gap: emit GAP_EVENT_PAIRING_STARTED and GAP_EVENT_PAIRING_COMPLETE

hci: funnel pairing operation via hci_pairing_started and hci_pairing_complete

bluetooth.h: fix typo

hci: update advertising data without stopping advertising first

gap: return status for `gap_set_security_mode`

gap: drop[ local bonding flag in IO Capability Reply if remote does not indicate bonding

hci: track HCI_EVENT_IO_CAPABILITY_RESPONSE received

fix Classic-only compile

fix build

gap: stop LE connecting if create connection fails (e.g. connectable adv active and multiple roles not supported)

gap: cache own address on start advertising and connecting, provide getters

gap: avoid requesting authentication twice

gap: store link key in hci connection struct to allow authenticate after pairing without bonding

MISRAC2012-Rule-8.3_b: match function declaration and definition

add 'U' to unsigned constants

hci: skip mutual authentication again

gap: re-configure advertisements after power cycle

gap: abort SSP pairing if MITM protection required but not possible

hci: store remote ssp io capabilities

gap: only store link key if it allows requested security level

hci: fix compile