gatt-service/hids_client: emit disconnected event on HCI disconnect and free connection struct

gatt-service/hids_client: emit GATTSERVICE_SUBEVENT_HID_REPORT_WRITTEN on hids_client_send_write_report

gatt-service/hids-client: emit GATTSERVICE_SUBEVENT_HID_REPORT for hids_client_send_write_report, fix #573

hids_client: extract hids_client_handle_can_write_without_reponse

license: update text

src: add title to header files

docu: extract GATT clients and services documentation from source code

hids_client: document api

hid: prefix hid.h and hid.c with btstack_

hids_client: move protocol mode to service, set protocol on boot mode, add report type as input param to get and write report functions

hids_client: implement enable and disable notifications

hids_client: implement set protocol mode, suspend and exit suspend

hids_client: get protocol mode, update pts test

hids_client: emit HID information

hids_client: fix report lookup, implement hids_client_send_get_report

hids_client: put external characteristics in a separate array

hids_client: merge states for boot and report mode

hids_client: store HID descriptor

hids_client: parse all EXTERNAL_REPORT_REFERENCE descriptors

hids_client: rename states, fix external report search

hids_client: rename variable

hids_client: get HID Descriptor and External Report Reference from Report Map Characteristic

hids_client: get report ID from external report reference

hids_client: store boot input characteristics mapping into reports array

hids_client: implement hids_client_send_report