Reg up plus

Enhance connectivity reliability; fix client object_device examples; add object_location implementation; pure lwm2m_malloc() & lwm2m_free() usage, add client arguments for more convenience local/server port configuration with defaults matching to eclipse leshan.
The intention was to sync the communication setup to a standard use case where the server (like leshan) offers to CoAP endpoints, Port 5683 (unsecure: coap) and Port 5684 (secure: coaps). This directly fits to the current leshan default setup (and to the proposed modified(!) wakaama server). So I would take up your proposal in a modified way: Lets run the client under Port 15683?