Add more lines and color materials to default palette

[Pullusb]

Some user feedback stated that there should be 3 more lines and fill with colors other than the classic colors,

This way user can be customize for specific case.

Don't want to crowd the default stack too much, there is already a good number. But the user having to create material for normal storyboard usage can indeed be a pain...

Here is the current default material stack as of Storytools version 2.7.0 :

User feedback is welcome on this subject, for expected default line/colors in a classic storyboard workflow.