goep_client: use separate buffer for l2cap

goep_client: cuse l2cap ertm channel

goep_client: implement sdp query to get l2cap psm, implement l2cap functionality

goep_client: implement l2cap variants

goep_client: refactor goep packet generation

goep_client: refactor rfcomm packet handler

goep_client: add goep_client_add_header_application_parameters

goep_client: fix handling of RFCOMM Channel Closed Event

handle SDP query error

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

pbap: add Phone Book Access Client (PBAP) over General Object Exchange (GOEP)

create RFCOMM connection
send OBEX Connect and receive response
retrieve phone book
repeat GET request when response inc

pbap: add Phone Book Access Client (PBAP) over General Object Exchange (GOEP)

create RFCOMM connection
send OBEX Connect and receive response
retrieve phone book
repeat GET request when response incomplete
start extracting goep_client.h
support CONNECT message
support GET message
add obex_iterator
use obex_iterator
goep_client adds connection_id if available
avoid accessing internal goep state from pbap
start extracting pbap_client.h
events: add meta events and data packet types for GOEP and PBAP
use events and data packet type for goep
use events and data packet type for pbap
remove private fields from GOEP_SUBEVENT_CONNECTION_OPENED
implement SetPhoneBook
return cid in connect operations, return errors if busy, return obex errors
limit OBEX packet size by bearer MTU
split into obex.h, goep_client.h, goep_client.c, pbap_client.h, pbab_client.c
fix state after pull phonebook
add console UI for testing
clean up code
provide packet_handler in create connection for pbap_client and goep_client
annotate headers for goep_client and pbap_client

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