vega libraries and built-in examples update

see #81 and #82 for more info.

new examples:

vega-lite and examples update to v4.8.0

see #80 for more info

updated vega-lite examples:

vega-embed and vega-lite library and examples update

see #77 and #78 for more info

plus new vega-lite example:

vega-lite and vega-embed libraries and examples update

see #75 & #76 for more info

new built-in vega-lite examples:

all vega libraries update

• new vega examples ...

• new vega-lite example:

vega-lite library v4.4.0 update release

see their release notes for changes:

https://github.com/vega/vega-lite/releases/tag/v4.4.0

vega-lite v4.3.1 lib and examples update release ...

new examples ...

vega libraries and examples update + new Vega viewer toolbar UI

• added new Refresh and View Online UI to the Vega Viewer toolbar

see changelog for other update details

new examples:

alpha vega gists support release

see ticket #59 for more info

try it with this bar chart gist: https://gist.github.com/domoritz/455e1c7872c4b38a58b90df0c3d7b1b9

or via GistPad ... lostintangent/gistpad#89 (comment)

added URL encoded Vega specs from online Vega Editor preview

with options to save it for local edits. See ticket #58 for more info.