red-brick/pw: Perl page can now edit all Perl options
red-brick: Prefix all error prints on settings tab with function names
red-brick: Only look at log directory for listing log files
red-brick: Remove unnecessary checks from logs model creation

The checks are not needed anymore because only log files are listed now.
red-brick/pi: Fix directory list creation to include empty directories
red-brick: Ensure that REDFile WriteAsyncData and ReadAsyncData are created on the UI thread

Otherwise their signal/slots wont work properly.
red-brick/pi: Fix UI update from logs listing