example: fix command line address parsing

example: use GAP_SUBEVENT_LE_CONNECTION_COMPLETE instead of HCI_SUBEVENT_LE_CONNECTION_COMPLETE

examples: unify status stdout format

example: fix warnings

license: update text

examples: use `btstack_event.h` getters instead of direct array access, use enum to compare status codes

docu: copy editing examples titles

example/gatt_heart_rate_client: skip reading Sensor Location if Characteristic not available

gat_client: rename status to att_status in GATT_EVENT_QUERY_COMPLETE event, add and use ATT_ERROR_SUCCESS instead of 0 status code

Use BTSTACK_FILE__ without __ prefix (MISRAC2012-Rule-21.1)

example: register for events after setting up the stack, register for hci events after sm_init()

don't use empty initializer [-Wgnu-empty-initializer]

example: new gatt_heart_rate_client example