avrcp: query player application settings

avrcp_controller: add Category 4 commands

avrcp_controller: add Category 3 commands

avrcp_cotroller: implement move to the first song in the next/previous group

avrcp: support SDP record without service name and/or provider

avrcp_controller: add supported feature flags for cover art

avrcp_controller: add avrcp_controller_force_send_press_cmd

avrcp_cotroller: use the same pointer for fragmented and normal commands, adapt avrcp_controller_send_custom_command to provide only parameters through data buffer

license: update text

avrcp_controller: implement avrcp_controller_get_now_playing_info_for_media_attribute_id

docs: use @return instead of @returns

avrcp_controller: rename event

src: add title to header files

avrcp_controller: added avrcp_controller_start_press_and_hold_cmd

avrcp: support de-init

# Conflicts:
# src/classic/avrcp_target.h

avrcp: fix reading packet type from vendor specific responses

avrcp: use defines instead of enum for features

avrcp: improve API documentation

avrcp: replace avrcp_target/controller_connect/disconnect with avrcp_connect/disconnect

Use FILENAME_H as include guard (MISRAC2012-Rule-21.1)

avrcp: remove browsing flag from create SDP record as it is pat of supported features

avrcp: introduce enum for suported features

fix includes for avrcp/avdtp header files

avrcp controller: add press and hold cmds

avrcp_controller: add avrcp_controller_send_custom_command that fragments outgoing commands