Added palette in Scene.

requires stuff from lol/math, too.

from all platform builds.

Constants : Added minus one.

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.

structures.

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

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.