Use inttypes.h macros for printing/logging (u)int32_t data

license: update text

mesh: annotate incorrect cpp nullpointer warning

mesh: add missing break in upper transport

mesh: free buffers in unit test

mesh: fix compile warning when compiling without btstack assert

mesh: fix warnings / corner cases

mesh: fix compile warnings

mesh: fix handling of segmented control message

mesh: fix access message builder for 3/4 byte values

mesh: improve mesh_upper_transport_find_pdu_for_lower

mesh: trigger mesh upper transport run if outgoing pdus could not be processed due to missing network pdus

mesh: upper transport skips over pdus for which an segmented outgoing pdu is already active

mesh: implement mesh_upper_transport_request_to_send

mesh: add mesh_upper_transport_schedule_send_requests and mesh_upper_transport_send_requests_pending

mesh: wait until message builder is ready before delivering access pdu to access layer

mesh: implement mesh_upper_transport_message_reserve

mesh: rework setup and send of upper transport control pdus

mesh: replace mesh_upper_transport_setup_access_pdu with message builder

mesh: add missing parentheses, track upper transport pdu len

mesh: remove dead code

mesh: remove transmic_len from mesh_access_pdu_t

mesh: use MESH_TRANSPORT_FLAG_TRANSMIC_64 to store transmic_len in mesh_upper_transport_pdu

mesh: use MESH_TRANSPORT_FLAG_TRANSMIC_64 to store transmic_len in mesh_segmented_pdu

mesh: sort lower transport, mesh_messge_pdu_get -> mesh_segmented_pdu_get, use bool for flags