Merge branch 'avdtp-source2' into develop

gap: unify inquiry, inquiry with rssi, and extended inquiry response into GAP_EVENT_INQUIRY_RESULT with optional RSSI and name. Update gap_inquiry example

hid_device: added HID Meta Events

clean up open/close stream api

add start/stop streaming events

send sine

move connect/open stream to a2dp

avdtp: use avdtp cid instead con handle

move handling stream endpoint state to avdtp source

avdtp: move sending code to app

a2dp: avdtp source sends sbc frames at constant speed

a2dp: introduce context, move common code to avdtp.c

a2dp: wrap source functionality

a2dp: enable packet handler

a2dp: draft implemetation so

a2dp: avdtp source sends sbc frames at constant speed

a2dp: introduce context, move common code to avdtp.c

a2dp: wrap source functionality

a2dp: enable packet handler

a2dp: draft implemetation source open stream

avrcp: add streaming connection opened/released events

avdtp source: introduce timer for storing audio data at const fr., encode into sbc, and prepare for sending

wav_util: fix return of wav_reader_read_int16

sbc: rename sbc to msbc test

sbc: improve usage output

sbc: fix makefile

sbc: remove hardcoded bitrate

avdtp: add encode/decode sine example without using ring buffer

avdtp: move ring buffer to stream endpoint

avdtp: add encode/decode test with ring buffer

sbc: use btstack_sbc_encoder_num_audio_frames - 1 audio frame contains 1 audio sample for mono and 2 for stereo

sbc: use btstack_sbc_encoder_num_audio_frames - 1 audio frame contains 1 audio sample for mono and 2 for stereo

sbc: revert sample counting

avdtp: source sending correct audio first time

avdtp: shorter timer for audio generation gets correct stream

avdtp: set state to AVDTP_STREAM_ENDPOINT_STREAMING_W2_SEND when more data is ready

avdtp: introduce transport category as mandatory

avdtp: introduce transport category as mandatory

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events: add params for BTSTACK_EVENT_NR_CONNECTIONS_CHANGED

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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avrcp: events definition

avrcp: reorder fields in AVRCP_SUBEVENT_NOW_PLAYING_INFO, extend event generator to handle multiple variable length fields

avrcp: play now event

avrcp: introduced shuffle and repeat

h4_ehcill/h5: provide HCI_EVENT_TRANSPORT_SLEEP_MODE event that indicates to app if it can put device into deep sleep

events: fix events where len(format) != len(params)

avrcp: send cmd unit_info

introduced general reject and reject events

emit configuration and capabilities

sink initiator smg pts tests

sm: provide le_device_db_index in SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED again

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