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.

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

static method that we can do without.

computation function.

compilation time for very little benefit and maybe even confusion.

- removed 0 CR characters
 - removed 188 trailing whitespaces
 - replaced 537 tabs with spaces

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

computed on demand with static initialisation.

fully initialised.

functions; also remove a lot of idiotic "using namespace std" from the
codebase.