Camera & vector.cpp : Fixed shifted_perspective crash with almost zero FOV.

Added utils.h : GetRandom(Array<T>) : gets a random element in a template list with weight logic.
                T FindValue(char*) : Find the value of a safe enum from the given name (when GetName is implemented)
                swap(T&, T&) is now in here too.

such as alpha blending, depth test, etc.

to get M_PI from the platform headers and cast it to float.

positive values, and add a unit test for rand<int>.

crashing from an assertion failure.

shitload of warnings Bullet spits at us.

structures.

the String class instead of the stack for logging, and get rid of
the old and useless BitField class.

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.

TODO : second pass on coding-style, and some tweak & usage modification.

a wavelength to saturated xyY function based on the standard observer
data.

files on some Unix systems.

I'm gonna commit this right now though I'm not really sure whether Visual
Studio will agree to build va_copy and others.

of unit tests for the String class.

some deprecated stuff.

hardcoded and only the fractal demo uses it, but everything will eventually switch.