example/sm_pairing_peripheral: split packet handler into sm and hci, allow to code on connection complete

example: use GAP_SUBEVENT_LE_CONNECTION_COMPLETE instead of HCI_SUBEVENT_LE_CONNECTION_COMPLETE

examples: unify status stdout format

example: remove call to le_device_db_init

license: update text

sm: deprecated sm_send_security_request

sm_pairing examples: handle ERROR_CODE_PIN_OR_KEY_MISSING

sm_pairing examples: report pairing started event

example: init gatt client for sm pairing examples, pretty print gatt result

example/sm_pairing: improve console output

sm pairing examples: print re-encryption events

add missing default switch cases

docu: copy editing examples titles

sm_pairing_peripheral: fix IO Capabilities for Secure Connections with Just Works

example/sm_peripheral + sm_central: improve comment, add example config for keyboard entry

sm: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode

example/sm_pairing_peripheral: disable security request on connection complete

Use BTSTACK_FILE__ without __ prefix (MISRAC2012-Rule-21.1)

sm_pairing_peripheral: only registser for sm events

sm_pairing_peripheral: add 0x1111 to service list, make it discoverable by sm_pairing_central

example: register for events after setting up the stack, register for hci events after sm_init()

merge fixes from master

example/sm_pairing_central: print SM_EVENT_PAIRING_COMPLETE

sm: sm_use_fixed_legacy_pairing_passkey_in_display_role -> sm_use_fixed_passkey_in_display_role

fix format warnings for uint32_t values