I took our website's SVG favicon and plopped it on a round
white rectangle in Affinity Designer. The I exported it as an SVG and
wrote a script that uses imagemagick to convert to the various sizes and
formats we need.
Closes#2307
This matches with the html in the VS Code repo and also fixes a problem
with the worker which loads HTML using data: and then can't load any
scripts because 'self' doesn't work.
This will make it work regardless of what the current URL happens to be.
Also move the telemetry setting into the options since we might as well
make use of it seeing as how we have to parse it for the base path
anyway.
By design the disable-telemetry flag does not affect extension
telemetry, only the setting does, so disabling the setting when the flag
is set should cause extensions to also stop sending telemetry.
Fixes#1116.
