Add support for wifi in the network configuration

[archlinux]

Add support for wifi in the network configuration

[grazzolini]

I do like the solution that archiso uses, mixing systemd-networkd + iwd. I think that something in that direction is what we should aim for. Because we already have code for systemd-networkd.

[grazzolini]

As discussed with grazzolini, we'll copy network configuration from the ISO for now.
And let the users use iwctl to manually configure wifi before starting archinstall (since, archinstall needs to be installed it requires functional internet at first anyway)

This situation will change if archinstall is ever added to the iso. In that case it could be responsible for the network configuration. As things are now, it's fine to have things simple now (copying wifi configuration from the iso) and then move to a more complex solution in the future.

Also, I really don't think archinstall needs to do all the heavy lifting. After all, the idea is to have an installer that incorporates Arch KISS principle. Having the users doing some of the configuration manually is within that spirit.

[Torxed]

Based on a discussion over at IRC, iwctl doesn't have a nice machine readable interface for its output.
They recommend python-dbus and to adopt their python examples using dbus.

[Torxed]

Appending some nice test code provided by mcon@irc://freenode/#iwd
It's Python bindings for iwd to communicate and monitor events.

ZM3UI.txt

[Torxed]

As discussed with grazzolini, we'll copy network configuration from the ISO for now.
And let the users use iwctl to manually configure wifi before starting archinstall (since, archinstall needs to be installed it requires functional internet at first anyway)

[Torxed]

Added the following, the zero-option copies the current network configuration from the ISO (live media).
It first inserts a dummy-option into the list of interfaces:

• https://github.com/Torxed/archinstall/blob/1c80a893acfb97859dd6c0f61a2cf74c03958595/examples/guided.py#L199
  And if zero (injected dummy interface) is selected, it stores it as is:
• https://github.com/Torxed/archinstall/blob/1c80a893acfb97859dd6c0f61a2cf74c03958595/examples/guided.py#L229
  And is then interpreted in guided during installation:
• https://github.com/Torxed/archinstall/blob/1c80a893acfb97859dd6c0f61a2cf74c03958595/examples/guided.py#L54-L55

Which in turn copies two locations from ISO to (by default) /mnt:

1. Copies PSK files for iwd: https://github.com/Torxed/archinstall/blob/405794d53f1f47e2a19a906dbdfa6ad39ea79c17/archinstall/lib/installer.py#L208
2. Copies .netdev/.network for systemd: https://github.com/Torxed/archinstall/blob/405794d53f1f47e2a19a906dbdfa6ad39ea79c17/archinstall/lib/installer.py#L216