Fixes #2377 - Added cid suffix to PartValue

[lucaelin]

Fixes #2377
This PR is NOT READY yet as i have not tested the cid behavior in case of docking and such...
It's also missing documentation as it is super hard for me to correctly formulate things like this 🙈

[Dunbaratu]

So if I understand the difference between UID and CID, is it this?

If you take the same craft file, and launch it twice under different vessel names "instance1", and "instance2", then this would happen:

This results in False:

• set test to (vessel("instance1"):parts[5]:UID = vessel("instance2"):parts[5]:UID).

But this results in True:

• set test to (vessel("instance1"):parts[5]:CID = vessel("instance2"):parts[5]:CID).

[lucaelin]

Exactly.

[Dunbaratu]

@lucaelin - You said this Pull Request was "NOT READY" when you first made it. That was quite a while ago. Do you still see it as "not tested" or do you want me to merge it for the release coming up?

[lucaelin]

I still havn't tested any docking scenarios... I'm gonna do that today. But in addition to testing the exact behavior, the PR still needs documentation.

[lucaelin]

I just tested docking and it works just like i expected it to. Once two crafts created using the same craft file dock to eachother, there are two parts on the (joined) craft with the same cid. Once undocked, each ship has its own part back :) The cid doesn't change in this process.