Added Ship Tree group IDs

[Nohus]

No description provided.

[GoldenGnu]

A little feedback:

1. If this data is already in the SDE, I think it's a mistake to duplicate it here, as there is a change it will be become outdated on changes. In my opinion, This should only contain meta id ranges, that are not in the SDE.
2. I think it's confusing to use the word Tree here, I would prefer Ship Group ID.

Feel free to totalt disregard this feedback, you're doing an amazing job with the documentation, this is just my opinion and It's fine if you do not agree :)

[Nohus]

@GoldenGnu

1. The data is not in the SDE to my knowledge
2. These are not the Ship Group IDs, which are in the SDE but are different