New More Compact Mesh Object & Solid Mesh

### 2.6.6 New More Compact Mesh Object & Solid Mesh

`mesh2`, the new mesh syntax is designed for use in conversion from other file formats. Flat and smooth triangles can be used in the same mesh, uv_coordinates are supported, also the possibility to specify a texture for a single triangle. When written to file, the size will be smaller than that of the 'normal' `mesh`. A `mesh2` will parse faster.

Solid mesh are now available in POV-Ray, this means that mesh can be used in CSG-objects. All that is needed, is to specify an `inside_vector` and a closed mesh object.