This is a squashed commit of the pivot chart implementation.

Some of the changes:
- Add pivot chart specific (pivot table) data provider which
  provides the data from a pivot table to the associated chart.
- When inserting a chart and the cursor is in a pivot table,
  in that case insert a pivot chart
- Modify the pivot chart when the pivot table changes
- Collect and set the number format for the values
- isDataFromSpreadsheet check for the creation wizard
- In ChartView (and VLegend) check if the data provider is a
  pivot chart data provider and get the pivot table field names
  to create the buttons on the UI.
- Adds the functionallity to show a filter pop-up (from calc)
  when clicking on row / column / page field buttons.
- Remove (X)PopupRequest as we won't need it.
- Add ODF import/export for pivot charts:
  + Added loext:data-pilot-source attribute on chart:chart
    which is the internal name of the pivot table with which the
    pivot chart is associated with. If the element is present, then
    the it means the chart is a pivot chart, else it is a normal
    chart
  + Added service to create pivot chart data provider through UNO
  + Add new methods to XPivotChartDataProvider to create value and
    label data sequences separately from the data source, which is
    needed for pivot chart import
  + When importing defer setting the data provider until a later
    time when we know if we are creating a chart od a pivot chart
- Pivot chart ODF round-trip test
- Add table pivot chart supplier API:
  This adds the XTablePivotChartSupplier and related interfaces so
  we can access, create, delete pivot charts from UNO in a sheet
  document. With this we now distinguish between normal charts
  and pivot charts. This was mainly needed because we can't extend
  the "published" interfaces of TableChartSupplier.
- Added an extensive test, which uses the API to create a new
  pivot chart when there was none, and checks that the pivot chart
  updates when the pivot table updates.

Change-Id: Ia9ed96fd6b1d342e61c2f7f9fa33a5e03dda21af
Reviewed-on: https://gerrit.libreoffice.org/36023Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>