example: use sdp_create_service_record_handle() for sdp record and assert sdp record buffer is large enough, fixes #489

examples: unify status stdout format

example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation

example/hsp: update examples

license: update text

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

hsp ag: emit HSP_SUBEVENT_BUTTON_PRESSED instead of audio connection setup/release

example: add 'delete link key(s)' to a2dp_source, hfp_ag, hsp_ag

docu: copy editing examples titles

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

example hfp/hsp: ignore SCO packets if connection handle doesn't match, use HCI_CON_HANDLE_INVALID

example/hsp_ag_demo,hsp_hf_demo: set codec to CVSD, fixes issue #177

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

autoconnect if STDIN is not defined

examples: unify local names and append BD_ADDR

remove Remove Ctrl-C from usage

fix warnings: mostly sign-compare

btstack_stdin: provide console input in callback

btstack_stdin: replace stdin_support.[ch] with btstack_stdin.h and platform implementations

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

fix unused parameters warning

stdin: add btstack_stdin_read() and use in examples

maths: aproximation of sqrt

example/hsp+hfp: extract SCO test code into sco_demo_util

example/hsp_X_demo: fix error report for HSP_SUBEVENT_RFCOMM_CONNECTION_COMPLETE