pywidgets 0.8

Added proper SVG support (vector resizable and currentColor tag respecting, unlike the QT defaults), major code cleanup, and various other small changes.
Changed packaging to use optional imports - windows async and online functionality aren't installed by default anymore, so if they're detected the sample page now defaults to using them.

pywidgets v0.7.1

code cleanups and minor changes

pywidgets v0.7

First public release.