[Feature Request] CompositeCell.Data compatibility issues with existing logic

[Freymaurer]

Issue

To interact between ARCtrl and Excel for example i use the CompositeCell.GetContent() function. This returns 1, 3 or 4 strings in an array. Which i also use to reverse the information into the correct cell type.

The new Data cell also returns 3 strings and makes the logic not unique anymore. Combined with a lot more settable fields i am unsure how to progress from this point:

ARCtrl/src/Core/Table/CompositeCell.fs

Line 50 in dc3822f

| Data d -> [| defaultArg d.Name ""; defaultArg d.Format ""; defaultArg d.SelectorFormat ""|]

Requirements

• CompositeCell.GetContent must return an array of strings, which must have a unique number of strings according to CompositeCell type.
• CompositeCell.GetContent must be fully reversible.
• Due to the same issue, Data cell information must always fully be written in excel. Currently it omits complete empty columns.

[HLWeil]

After discussion with @Freymaurer, this is not possible.

Header is necessary to distinguish between the types of 3 cell Data content and e.g. Parameter content.