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.

compilation time for very little benefit and maybe even confusion.

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

to the Tait-Bryan angles we had for now). Also, change quaternion storage
order to wxyz in order to match the constructors.

more unit tests for the quaternion to 3×3 matrix conversion.

with the unit tests.

Euler angles to a rotation matrix. Also fix quat::rotate() which was not
building the correct quaternion.

mathematical writing, and add static constructors to create quaternions
from a rotation.

code for all matrices.

"shader" source directory since we have "gpu".

the matrix code itself.