This will be needed for many of the commands in the LWM2M 1.1 Device
Managenent and Service Enablement Interface and Information Reporting
Interface.

Also prevents transactions from generating bad URI paths.

Signed-off-by: Scott Bertin <sbertin@telular.com>

The output of each is now valid as input to the other.

Also adds a uri_depth_t of URI_DEPTH_NONE and uri_toString return the
depth of the URI instead of one lower.

Signed-off-by: Scott Bertin <sbertin@telular.com>

IDs of LWM2M_MAX_ID now indicate an unset ID.
Adds LWM2M_URI_RESET to properly initialize an lwm2m_uri_t.

uri_decode changed to return the request type seperately. Pointer to uri
to be set now passed in instead of allocated.

discover_serialize and object_create changed to not modify the passed in
uri.

Additional validation of the created response.

Remove isUri from bs_data_t.

Signed-off-by: Scott Bertin <sbertin@telular.com>