Upgrading of generics with recursion

[FraserGreenroyd]

Following on from this commit as part of this PR, we need to strengthen up the Versioning for Generics. The implementation in the commit sufficed for the use case which was holding up several toolkits, so decision to merge as was, and raise this issue for future work (future being this milestone and not too far in the future) was agreed. This is the issue to capture that.

[FraserGreenroyd]

@IsakNaslundBh @adecler how does this look/work now with our new serialiser/upgrade system? I'm presuming this is still required but figured best to double check!

[IsakNaslundBh]

I think it most likely still could be relevant, but not sure. One that we almost would need to test.

Having a look at the particular commit referenced on the description of the issue, I ran in to similar issues with recursive generics for type creation whilst working with the serialiser engine, and implemented this method;

https://github.com/BHoM/BHoM_Engine/blob/5d4c70edd2c5823e651d38510190da86561b0764/BHoM_Engine/Create/Type/GenericType.cs#L153-L214

Might be more elegant ways to do it, but it works and don't think it is that inefficient, even though it is quite a few lines of code.

Potential to lift something like that over to the versioning toolkit as well, for the CleanTypeString method.

[IsakNaslundBh]

Once this is actioned, should make sure to cover the case added in #259 as well