prefix POSIX related HAVE_ defines

hci: always reserve 6 bytes as HCI_INCOMING_PRE_BUFFER, drop HAVE_BNEP flag

hci/gap: move set_class_of_device to gap

hci: re-add local version information callback for dynamic chipset configuration

add gap_scan_response_set_data

use hci_con_handle_t more

gap: declare more hci functions as gap functions

hci: set link_key_db via hci_set_link_key_db instead of via hci_init().

hci.h: mark transport config as const

hci.h: cleanup, mark functions as static

hci: move le_central_ + gap_le_ to gap.h

hci: COMMAND_COMPLETE_EVENT->HCI_EVENT_IS_COMMAND_COMPLETE. COMMAND_STATUS_EVENT->HCI_EVENT_IS_COMMAND_STATUS

hci_remote_eSCO_supported -> hci_remote_esco_supported

hci: mark most hci_emit_... as private

util.h: move some to hci.h and btstack_link_key_db_fs

move Bluetooth related types to bluetooth.h and BTstack types to btstack_defines.h

hci: notify if SCO can send now - triggered by DAEMON_EVENT_HCI_PACKET_SEND and if can send sco now is true

hci: notify if SCO can send now - if SCO flow control is enabled

hci: add hci_can_send_acl_classic_packet_now and hci_can_send_acl_le_packet_now

hci: extracted hci_number_free_acl_slots_for_connection_type

hci: remove callback for local information - use hci_add_event_handler instead

hci: replace hci_register_packet_handler with hci_add_event_handler

hci: add hci_add_event_handler, tunnel events through hci_emit_event and acl packets through hci_emit_acl_packet

split remote_device_db into btstack_link_key_db and btstack_device_name_db

move btstack_version.h to platform/daemon and only use by daemon