Reflection_Engine: AddToList method to be added

[IsakNaslundBh]

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Description:

Method like:

AddToListProperty(this IBHoMObject, string propertyName, object data)

or

AddToListProperty(this IBHoMObject, string propertyName, IEnumberable<object> data)

that basically pulls out the property, checks that it is a list, and adds the provided object(s) to it. Should probably use the second options, as it makes more sense from the side of the UI.

[FraserGreenroyd]

As SetProperty can handle this I am considering this issue complete by that action - feel free to reopen if you disagree @IsakNaslundBh

[IsakNaslundBh]

DOnt think this is fully closed out actually. SetProperty is overriding the list with new data while this would instead add, keeping pre-existing items in it.