* route 'Loading script...' messages through the debug logging framework
* they are now controllable via debugfilter. to turn off, add this to your dfhack.init file: debugfilter set Warning core script
* clarify debug logging docs
* prevent DEBUG messages from being compiled out of the binary
* recolor INFO messages so they blend into existing console output
* add configuration interface for log message header elements so they are individually configurable. all default to off