Fix command line

[narc0tiq]

The command line thread doesn't really have a prompt currently because debug stuff gets printed to stdout a whole lot, which makes it impossible to keep the prompt properly positioned.

I see two things that need to be done to fix this:

• debug logging should be thrown into an actual log file (truncated to zero on every start)
• printing to console should be done via a function that will also print a \n before everything and reprint the prompt (along with any user input to date; I'm sure I saw something about that in readline doc) afterwards

I'm tentatively assigning this to myself, as I have a burning desire to personally figure it out.