SyncLab: Documenting supported items

[alexfjw]

Probably a good idea to clearly document what is supported by SyncLab.

Legend (github's checkboxes don't play nice when nested): [] = untested property [-] = supported property x = unsupported property

Currently supported:

• text (incomplete, see issues on tracker)
• lines
• shapes (incomplete, see issues on tracker)
• images
• placeholders

Might be able to support (requires testing to determine):

• SmartArt (see #1581)
• wordart (low priority, word art is not often used)
• tables
  • [] special formatting for first/last row/col
  • [] horizontal & vertical banding
  • [] table direction (LtR/RtL)
  • [] Title (not sure what this is)
  • x Table background (unable to set this in MS PPT 2016 as a user as well)
  • x Table Style (probably a quickstyle, might be able to set the 'style' of the table by editing each cell manually)
  • [] row height for each row
  • [] shape for each cell
  • [] borders for each cell (each border is a LineFormat, each cell has 6 borders)
• chart (don't think we want to support this anytime soon)
  • [] chart font
  • [] autoscaling
  • [] walls (thickness, picture type)
  • [] sidewall
  • [] backwall
  • [] chart area (left, top, width, height)
  • [] chart style (probably one of the color styles)
  • [] chart type (XlChartType - pie, column, line etc)
  • [] depth percentage
  • [] displayBlanksAs (type of default blank cells in chart)
  • [] elevation
  • [] floor (for 3d charts, has PictureType, Thickness)
  • [] chart format (settings for fill, glow, shadow, edge..)
  • [] gap depth
  • [] has fields
  • [] rotation
  • [] plot by columns or rows
  • [] PlotVisibleOnly (hides hidden cells from excel data)
  • [] show YYYY buttons (YYYY = field, axis field, legend field, report filter filed, value field)
  • [] show data labels over maximum
• media clip
  • [] loudness. probably needs some audio analysis to sync perceived loudness
• x diagram (for internal use only)

[alexfjw]

Notes on PlaceHolders:

• cannot directly differentiate between all vertical types, Body, Table, Chart, Picture & possibly SmartArt (requires investigation) shape.PlaceHolderFormat.Type gives ppPlaceHolderObject for the above types. All other properties of PlaceHolderFormat do not give usable output.
• can indirectly guess if placeholder is a Picture, by accessing shape.PictureFormat.CropTop. A non-picture will throw an exception. (eg, textbox types)
• can guess if placeholder is a Body, by checking shape.HasTextFrame.