Add .inf file for extracted files

[geraldholdsworth]

Asked by lurkio on Stardot forum:
Are you planning to output a .INF metadata file together with the actual base file when the user wants to export a file from a .SSD? That's the standard way that previous Beeb disc apps have settled on in order to export a file's directory name and load and exec addresses and lock-status (so that the file can later be imported onto another disc-image if the user wants to).

[geraldholdsworth]

.inf files added in 1.05.2. The format of the resultant file may come under review in future versions, as will the facility to opt out of producing such files.