Cell value with ability to manipulate cell

[gastendonk]

Based on the evaluationResult we want to manipulate the cell before or after. The evaluationResult should implement the interface ValueWithCellAccess, which has the methods getValue(), applyBefore(cell) and applyAfter(cell). The methods will be called in PoiCellData.writeToCell() around the updateCellContents(cell) call.

This concept is similar to WritableCellValue, but it just extends the default behavior while WritableCellValue has to do everything itself.

It might be also similar to jx:updateCell and CellDataUpdater.

Background: Our applyBefore code would create an Excel note. We want to create Excel reports and then want to re-import the Excel file. In the note there are source informations for how to save the field value.

[SoltauFintel]

see PR #262