SOME/IP based uEntities cannot send messages to uEntities using the default instance ID

UUris currently support the usage of 0x0000 as the _uentity instance ID_ in a UUri. However, deploying a uEntity using an instance ID of 0x0000 makes it hard (if not impossible) to correctly route messages originating from uEntities using SOME/IP, where _service instance IDs_ must be in the range [0x0001, 0xFFFE].

We should therefore no longer support the usage of 0x0000 as the default instance ID but instead define the valid range for UUri's uentity instance IDs analogously to the SOME/IP service instance ID range.