support for enable_if and other template metaprogramming techniques),
for Clang (related to static const template class member initialisation)
and for GCC (related to forward declaration of non-int enum classes).

MASK to SWIZZLE in the vector templates, rename matrix<> to mat<> for
consistency, implement transposition for all matrix sizes, make matrix
columns private and only accessible through operator[].

quaternion, improve quat::rotate(vec3, vec3) to gracefully handle corner
cases, and add unit tests for all of these.

Added workbench, for personnal experimentation.

Constants : Added minus one.

SceneSetup : Added ClearColor command
EZMesh : Added Dup[ ... ] command && cgs command syntax refactor
MViewer : Tweak & dictionnary.js updates

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

numeric : Added SmoothClamp & swap
camera : fixed target&up issues and added screen-scale factor.
touky_demo : correct camera integration & first pass on uro refactor. Also added Makefile to vcproj

MeshViewer : Camera update and small object tweak.
             ortho to perspective transition is now perfect.