To know and manage the fact that gui or installer
started a bitcoind sub process, the process child
is wrapped and passed by the different state of the app.
During installation, the user may choose for Liana to configure and start bitcoind for them.
This internal bitcoind uses as its data directory the `bitcoind_datadir` folder within the
Liana data directory.
If the internal bitcoind option has been selected for a network, it will be automatically
started when the user returns to Liana and stopped when Liana is closed.
If no daemon config path is present in the
gui config, gui will try first to connect
to the socket pat, either `daemon_rpc_path`
if present in configuration file or default
path.
close#147
Installer has its own log file installer.log that is removed
after successful install.
When changing network, the destination log file change
to <datadir>/<network>/liana-gui.log
should_exit method is replaced for the
iced:🪟:close() command at the main.rs
level. iced_native::Event message handling
is not anymore required in the sub states of
the iced application.
