fix(trdl): run self-update in background when trying 'trdl use'

[distorhead]

• Added 'multiwerf self-update' command.
• Multiwerf will initiate background self-update process before trying to use trdl (for safety reasons self-updates should always work).
• Refactor 'multiwerf use' command + try-trdl logic: more correct logging, remove self-update delay if any error have occured, which is related to the try-trdl logic.