Improve the "my own URLs" construction, such that:
- IPv6 link-local addresses are always skipped. They require a "zone index"
string, typically the interface name, so something like
`[fe80::cafe:f00d%eth0]`. This is not supported by web browsers, so the
URLs would be of limited use. Furthermore, they require the interface
name of the side initiating the connection, whereas this code is used to
answer the question "how can this machine be reached as a server?"
- IPv4 addresses are sorted before IPv6 addresses. Even though I like IPv6
a lot, IPv4 is still more familiar to people.
- Loopback addresses (::1, 127.0.0.1) are sorted last, so that the First-
Time Wizard is most likely to use the bigger-scoped address.
This adds a `-wizard` CLI option to the Manager, which opens a webbrowser
and shows the First-Time Wizard to aid in configuration of Flamenco.
This is work in progress. The wizard is just one page, and doesn't save
anything yet to the configuration.
Convert "get own URLs" code into nicer chunks, and test those.
This minimises the code that actually depends on the available network
interfaces, and increases test coverage. Found a few bugs too.
Due to the way SSDP works, Flamenco Manager needs to know its own URL,
where the Workers can reach it. These URLs are now found, and since there
can be multiple (like IPv6 + IPv4) they are all sent in a SSDP
notification as ;-separated strings.
