Galador.ExcelGrid

This code is a rework and trim down of that other GitHub repository: https://github.com/PropertyTools/PropertyTools

I extracted only the code relevant to their (Excel like) DataGrid, targeted .NET6, renamed a few namespace and voila. Aiming for a simple, self contained spreadsheet control looking like Excel.

I also added their original WPF samples (ExcelGridDemo). And added a sample to experiment with the data model I am aiming for: SimpleGrid.

About SimpleGrid sample and other changes Also made the following changes to the original DataGrid (from https://github.com/PropertyTools/PropertyTools)

• Removed some steps between IDataGridOperator to rendering and edit control instantiation
• Removed the build color edit support (since I didn't copy across the color picker)
• Fixed some resize (column/rows) bugs
• Added IsReadOnly property
• Added full support to 2 additionals models types that act like string[,] and Cell[,].
  • Galador.Document.Grid.StringGridModel
  • Galador.Document.Grid.CellGridModel

Remark to succesfully use those 2 new models, one need to use the new Galador.WPF.ExcelGrid.ExcelDataGrid that use the appropriate IDataGridOperator and IControlFactory.

Remark One can also use custom subclass of Cell for the CellGridModel and register an IControlFactory to render them.

Remark maybe one day add formula to Cells with Lua? (https://www.moonsharp.org/)