Add material database to SolidDesigner

[michael_kahle]

Add a meterial database to SolidDesigner, which includes information about density, strenght, color, transparency, hatch pattern, texture map ... This database should be expandable (add materials, add proberties) - and proberties should be assigned to parts automatically, when assigning a material to it (Say p1 is steel --> color get's silver-grey, density gets 8 g/ccm, ...)