license: update text

docs: use @return instead of @returns

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

mesh: implement mesh_upper_transport_request_to_send

mesh: add API docs for mesh_upper_transport API

mesh: rework setup and send of upper transport control pdus

mesh: replace mesh_upper_transport_setup_access_pdu with message builder

mesh: store current segment in mesh-upper-transport-builder

mesh: introduce mesh_upper_transport_builder

mesh: track alloc error in message builder finalize

mesh: introduce finalize function for access and upper transport builders

mesh: remove mesh_access_pdu_t getters

mesh: remove mesh_transport_pdu_t from lower and upper transport

mesh: use mesh_access_pdu_t for outgoing segmented access messages

mesh: remove mesh_upper_transport_set_higher_layer_handler, deliver pdu sent via corresponding access/control handlers

mesh: extend callback params for received access and control pdus

mesh: use incoming_network_pdu_raw and incoming_network_pdu_decoded in upper transport

mesh: mvoe mesh_transport_pdu_t allocator/free to lower transport

mesh: move mesh files to src/mesh, update includes

mesh: fix prototypes

mesh: only use mesh_node_primary_element_address_get

mesh: add fields for acknowledged access messages, register for transport sent

mesh: extract mesh_upper_transport_pdu_free

mesh: mesh_transport_init -> mesh_upper_transport_init

mesh: move src/ble/mesh to src/mesh