Worlds merging and autounwrapping

Recent changes:

• Correct detection of NVIDIA G80 cards.
• Support of framebuffer multisample and blit extensions in OpenGL.
• Removed parallax_aspect parameter of mesh_base and mesh_detail_base materials, it's calculated automatically now.
• Dynamical world merging.
• Fix of layer animation blending.
• Refactored MathLib for physics needs.
• Automatic unwrapping of meshes in ResourceEditor / Viewer.
• Updated reference manual with convenient navigation.

Physics module is on the way, right now its math core is being refactored heavily.

Results of automatic unwrapping:

Packing algorithm should be improved a little, but it works good even now. This feature will be used for rapid PRT calculation, which requres unique UV mapping on second channel.

By the way, we've created a new character for the tutorial, Angel Girl (she will be in "Sanctuary" demo also):