Changes

== Material Game Substances ==TBA - Game substance unit type (defined in <code>/material/material.db</code>) got new physics float attributes: <code>bump_granularity</code>, <code>bump_amplitude, </code> and an integer attribute: <code>bump_perlin_order</code>. They are used to describe bumpiness of the material substance. TBA - Additionally substance unit also got new token attribute: <code>sound_class</code>. It is used to determinate type of the sound that is played when player is driving on the geometry with material using given substance. There is 6 different sound class types currently:* <code>asphalt</code>* <code>rumble</code>* <code>gravel</code>* <code>dirt</code>* <code>grass</code>* <code>generic</code>