sm: ENABLE_MICRO_ECC_FOR_LE_SECURE_CONNECTIONS enables micro-ecc software implementation

hci: use max le data length if supported by controller

hci: add command templates for LE Data Length commands

hci: Controller to Host Flow Control + docs

tool: add update_filename.py that adds __BTSTACK_FILE__ to every .c file for use with debug output instead of __FILE__

hci: mark hci_write_local_name as Classic only, hci_le_generate_dhkey depend on HAVE_HCI_CONTROLLER_DHKEY_SUPPORT, reduce HCI Command Buffer size for LE only

hci: configure Broadcom chipsets to send SCO data via HCI transport

hci: add commands for dealing with OOB data for classic pairing

hci: read local name during init

hci_cmds: add hci_flush

add le commands for reading and generating diffie-hellman keys via hci commands

hci: enable Default Erroneous Data Reporting for SCO over HCI

hci.h: cleanup, mark functions as static

btstack-config.h -> btstack_config.h

structure btstack-config.h

hci_cmds -> hci_cmd