Python-pptx

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- Hotfix: failed to load certain presentations containing images with
uppercase extension

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- Add read/write font color property supporting RGB, theme color, and inherit
color types
- Add font typeface and italic support
- Add text frame margins and word-wrap
- Add support for external relationships, e.g. linked spreadsheet
- Add hyperlink support for text run in shape and table cell
- Add fill color and brightness for shape and table cell, fill can also be set
to transparent (no fill)
- Add read/write position and size properties to shape and picture
- Replace PIL dependency with Pillow
- Restructure modules to better suit size of library

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- Add read/write access to core document properties
- Hotfix to accomodate connector shapes in _AutoShapeType
- Hotfix to allow customXml parts to load when present

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- Add paragraph alignment property (left, right, centered, etc.)
- Add vertical alignment within table cell (top, middle, bottom)
- Add table cell margin properties
- Add table boolean properties: first column (row header), first row (column
headings), last row (for e.g. totals row), last column (for e.g. row
totals), horizontal banding, and vertical banding.
- Add support for auto shape adjustment values, e.g. change radius of corner
rounding on rounded rectangle, position of callout arrow, etc.

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- Add support for auto shapes (e.g. polygons, flowchart symbols, etc.)

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- Add support for table shapes
- Add indentation support to textbox shapes, enabling multi-level bullets on
bullet slides.