feat: improve logs in daemon/server

[angelofallars]

Some log statements don't appear that clear to the end user.

For example, when swhkd receives a misc. signal:

log::warn!("Got signal: {:#?}", signal);
exit(1);

It only says that it received a signal, but nothing about exiting the program. This can be confusing, so I added a message to say that swhkd is going to exit:

log::warn!("Received signal: {:#?}", signal);
log::warn!("Exiting...");
exit(1);

When swhks receives a message from swhkd, all information about the message is condensed into one line:

log::debug!("Socket: {:?} Address: {:?} Response: {}", socket, address, response);

Splitting the three fields into three lines improves the clarity of the log:

log::debug!("MESSAGE:");
log::debug!("Socket: {:?}", socket);
log::debug!("Address: {:?}", address);
log::debug!("Response: {}", response);