bnep: review UNUSED-size

gatt_client: add gatt_client_stop_listening_for_characteristic_value_updates

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

LE: require ENABLE_LE_SIGNED_WRITE for ATT/GATT Signed Writes

fix unused parameters warning

fix compile

sm: sm_cmac_start -> sm_cmac_signed_write

gatt: log gatt client events to hci_dump

gatt_client: store notification callback, fix characteristic serialization. ancs_client: also listen for notification source notifications

gatt_client: use att_dispatch_client instead of att_dispatch_server functions

gatt_client: drop packet handler for gatt_client_write_value_of_characteristic_without_response

add classic/core.h and ble/core.h, add ENABLE_CLASSIC where missing

event: introduce hci_event_packet_get_type

use hci_con_handle_t more

use hci_con_handle_t more

event: support Service, Characteristic, Characteristic Descriptor in event generator needed for GATT Events. use new getter in examples

gatt_client: extract functions to deserialize gatt client structs and provide in gatt_client

gatt_client: prefix gatt structs with gatt_client

gap.h: use gap_ instead of le_central_ or gap_le_

gatt_client: drop subclient struct and id. pass in callback for requests. new gatt_client_listen_for_characteristic_value_updates for notifications and indications with client provided storage

att -> att_db

util.h: rename swapX into reverse_x

util.h: new names uuid_has_bluetooth_prefix();uuid_add_bluetooth_prefix()

att_dispatch: wrap calls to l2cap_can_send_fixed_channel for att client/server

gatt_client: use btstack_packet_handler instead of (*fn)(type,packet,size) for events