Split IGridViewDataSet in multiple interfaces

[tomasherceg]

• IDataSet
• IPageableDataSet
• ISortableDataSet
• IFilterableDataSet

[djanosik]

I think the names of interfaces should not contain the word "GridView", because we will also use it in other controls.

[tomasherceg]

Agree, but:

1. Since the GridViewDataSet was present in 1.0 and it is used on many pages in almost every app, it would be a big breaking change.
2. The DataSet class is already taken and it would lead to a bigger confusion.

Maybe we could create the DotvvmDataSet and use type redirection, but I don't know what limitations or issues it would bring. We should do a research of this.

[djanosik]

I don't think we need one common DataSet implementation, but we need some common interfaces. We can surely keep GridViewDataSet and IGridViewDataSet. However, I think we shouldn't release this change until we know what we need from DataSets in BusinessPack.

[tomasherceg]

Ygree, we should wait with further changes until we have e.g. grouping support in Business Pack GridView.