Improved PowerPoint export

We've heard your feedback on PPT export and revamped it to be more polished and convenient.

Fonts are now embedded automatically so you don't have to download them
Text wrapping and positioning is more predictable
Backgrounds are now part of the slide master and don't get in the way when editing
Content will scale better to fit the slide instead of overflowing
Font sizes are now round numbers for easier editing in PPT