Create cube with textures

[ibizaman]

We should be able to easily add cubes with textures. There should be 6 faces (obviously) and only 3 textures : top, side and bottom.

[ibizaman]

There is no way to use less than 24 vertices when creating a textured cube :

    5-----6
   /|    /|
  / |   / |
 1-----2  |
 |  7--|--8
 | /   | /
 |/    |/
 3-----4

The most efficient way, using textures, is to define a triangle strip for each face with its own vertices. See here and here.

[ibizaman]

Done with and 1adca0e