Excel-type selection for TMSFMXGrid

For the Firemonkey grid, it would be nice to include an option for the usual selection method in spreadsheets (e.g. Excel), i.e. to select columns by clicking on the fixed column cells (incl. shift-click and ctrl-click), and rows by clicking on fixed row cells. When clicking inside the spreadsheet, the whole row or column should not be selected, but only the clicked cell or shift-clicked cell range.