Configurable logging

[mcurlej]

Add options to joft.config.toml for logging:

• logging on/off (like env var)
• file logging on/off
• path to logfile configurable (default?)

Add also as CLI options

[frenzymadness]

I'd configure two things in the config file:

• Log level - setting this too high is like turning it off.
• Log destination - can be whatever like stdout, file, syslog, …