Brave (and maybe other browseres) refuse to set the 'User-Agent' header
in XMLHTTPRequests, and are vocal about this in the debug log. Since the
OpenAPI code generator always outputs a custom 'User-Agent' header, I've
added some JS code to strip that off when constructing an API client.
This commit does not introduce functional changes, besides renaming
every mention of 'wizard' with 'setup assistant'. In order to run the
manager setup assistant use:
./flamenco-manager -setup-assistant
The change was introduced to favor more neutral and descriptive working
for this functionality. Thanks to Sybren for helping to get this done!