added chart support for word and powerpoint in addition to excel (#7046)
* added chart support for word and powerpoint in addition to excel
* _msOfficeChart.py added
* changed WordChart to _msOfficeChart.OfficeChart and fixed a problem regarding error in word while processing the formula
* changed OfficeChartElement to OfficeChartElementCollection, removed getChartSegment and changed comments from excel to office
* Updated to include escape for chart in word and excel
* Add translator comments
* Excel: make the parent of any chart the active worksheet, so that switching sheets is still correctly supported.
also ensure that charts are not classed as being in Excel's treeInterceptor, so that they can be dismissed properly with escape.
* Powerpoint appModule: after focusing ona chart in slide view, you now must press enter on the chart to interact with it. This ensures you can still move the chart around the slide with the arrows like any other shape when not interacting.
* Remove excelChart.py. No need to keep it here, it is in the git history.
* Fix copyright statement.
* Add translator comment