scene so that g_scene can be deprecated later.

- removed 510 CR characters
 - removed 26 trailing whitespaces
 - replaced 0 tabs with spaces
 - fixed 15 svn:eol-style properties

classes instead of Video.

in the scene where we can push and pop cameras.

currently works for images (SDL and GDI+ loaders) and sound samples.

Useage : "...[.... csg*]" equals "current mesh -CSG- the mesh in the braces".
Keywords :  CsgUnion<csgu>, CsgSubstract<csgs>, CsgAnd<csga>, CsgXor<csgx>
TODO : cleanup useless code.
TODO : Some bugs are still present, some face that disappear should not.
TODO : Correct epsilon useage (see geometry files).
TODO : Coplanar face are not handled -at all-.
TODO : Vertex count goes through the roof in case of a Xor.

on Windows if using Visual Studio; if using MinGW, try to stick to the
original main() entry point.

do not open a console at startup.