hci: assert can send now in initialization run

hci: fix unused warning

hci: fix unused variable warning

hci: run substate machines, esp. halting, before other commands to assert reliable power down

hci: extract hci_halting_run and hci_falling_asleep_run

hci: remove timer during power down

hci: make hci_number_free_acl_slots_for_connection_type public

hcI: add 1000 ms watchdog that forces power off for hci_power_control(HCI_POWER_OFF)

hci: extract hci_discard_connections

hci: extract hci_whitelist_free

license: update text

docs: use @return instead of @returns

hci: use hci_trigger_remote_features_for_connection on connection encrypted

hci: exract hci_trigger_remote_features_for_connection

gap: use gap_inquiry_set_scan_activity

gap: gap_inquiry_set_scan_activity to set Inquiry Scan Activity

hci: fix len of GAP_EVENT_PAIRING_COMPLETE

gap: allow to set Page Timeout with gap_set_page_timeout

hci: move /* fall through */ before next case statement after #ifdef/#endif to silence implicit fall through warnings from esp32 gcc 8.4

hci: query remote features only once

sm + hci: complementary functions to remove packet handler

hci: request remote features before initiating our authentication

hci: remove tracking for hci commands that are sent by gap

hci delete stored link key, hci le set random address, hci le set advertising enable

hci: add hci_le_random_address_set to set random address. Advertisements are restarted if random address is used for advertising

gap: only read pairing oob data on request