#4650 changing the cell color changes the button color

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36998 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4650 always update spreadsheet stylebar when selection has changed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36999 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4650 set cell format color on update

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37000 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove selection of cell (text-input) if the SpreadSheetColumnHeader or SpreadSheetRowHeader is clicked

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37001 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e