This takes the raw log YAML file tuhi saves for each interaction, extracts the
pen data and then creates an SVG from that. Good for testing whether the
stroke parsing is sane.
Where --all is given, it will search through the directory that tuhi uses to
store the raw logs.
Two fixmes: the pointsize is hardcoded to 5 (intuos pro) because there's no
easy way here to get the point size. Same for the pressure range.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>