Routing mode starts by M15 (or G01, G02, G03) and ends by M16 or M17.
Accept now a end routing if a G00 (start move) G05 (switch to drill mode) or M30 (end of file) is encountered.
Previously, the M and G00, G01, G02 and G03 commands were read, but nothing was actually done.
The current support is a bit rough, but it allows reading some drill files with routing commands.