example/le_streamer: use separate characteristics for rx/tx

example/le_streamer_client: use gatt_client_request_can_write_without_response_event

example/le_streamer_client: support full duplex using notifications and write without response

example: fix warnings for printf of uint32_t values

docu: add example tags, fix table for pdf

example/le_streamer_client: provide template to set connection interval

le_streamer_client: don't start scanning on disconnect caused by shutdown

example/le_streamer_client: don't print test data but measure throughput instead

example/le_streamer_client: unregister from notifications, reconnect after disconnect

le_streamer_client: remove 'hidden' break, fix test

example/le_streamer: print connection interval and connection latency on connect

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

example: fix warning for unused argc, argv

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

example: add le_streamer_client that connects to le_streamer