hci: trigger read remote features from gap_request_security_level

hci: fix stack init with HAVE_HOST_CONTROLLER_API, send read local name only without HAVE_HOST_CONTROLLER_API

hci: fix unused warning

hci: postpone hci remote features query until requested by l2cap

hci: add hci_remote_features_available and use in l2cap

hci: prioritize authentication commands over remote feature requests

ESP32 does not handle remote feature request (and probably other link layer messages) after authentication has started

hci: move le data length checks into run function

hci: move check for le write host supported to run function

hci: move check for BCM controller into run function

hci: remove init command complete handler for (HCI_INIT_DONE-1)

hci: call hci_init_done only from run function

hci: send classic/le commands only if supported

hci: move check for write secure connections mode to run function

hci: send write simple pairing mode if supported

hci: only send read local buffer size if supported

hci: fall through to read local supported commands

hci: move check for need_baud_change to run function

hci: fix build without classic support

hci: emit HCI_STATE_WORKING after pending gap tasks have been completed

hci: extract hci_run_gap_tasks_classic

hci: convert write page scan activity and type in to gap tasks

hci: convert write scan enable into gap task

hci: swap write page timeout with write scan enable

port: drop support for iOS

gap: ENABLE_EXPLICIT_LINK_KEY_REPLY allows for asynchronous link key lookup by application