define BTSTACK_EVENT_REMOTE_NAME_CACHED, and implement event emit code

added hci_close() that trigger remote device db close, added remote device db parameter to hci_init(), implemented NSUserDefaults backed link key storage

drop link key only on authentication error

replace link_key_db_t with a remote_device_db_t that also holds cached remote names

remove accidental copy and paste

keep baseband connection during authentication

keep track of authentication commands and events

set local name to hostname

streamline hci_transport interface: only have single send_packet(type,data,size)

mark hci cmd templates as const to save RAM

correct custom init calling code

removed bt_control_t null_control

send custom init code if nececessary

flow control working, disable some dbg msgs

add counters for flow control, channel credits event, return -1 if no space in BT module

track number of outgoing packets in BT module

keep track of ACL packets in controller

read buffer size on hci init

use single packet handler per protocol layer: hci

use single packet handler per protocol layer: hci_transport

fix typo, use log_ macros

use new debug.h

set len in BTSTACK_EVENT_SYSTEM_BLUETOOTH_ENABLED correctly

implement L2CAP packet recombination in hci.c using a max size L2CAP buffer per connection

add buffer to hci_connection_t to allow for ACL recombination