We now have a box_t<T,N> template class. Which means we can have
4-dimensional AABBs. Why? Because we can.

In release mode our asserts are ignored for performance reasons and all
the code they may be executing is disabled, so no side effects will happen.
We can’t put programming logic in asserts.

Scene rendering logic is now better

The “f” suffix is valid GLSL, but WebGL does not like it so let’s disable it.

Box objects (AABB) now have the long awaited extent() and center()
methods. Corners are now called “aa” and “bb” for convenience. The
WorldEntity class uses a box3 for its AABB instead of two vec3s.
This allows us to simplify a lot of verbose code.

When a thread is destroyed during the atexit() callback cleanup, it cannot
be joined and sits there doing nothing if the CRT is Visual Studio 2012 or
2013. Microsoft has stated that they would not be backporting the fix from
Visual Studio 2015. As a workaround we call ExitThread() forcibly after
the thread exits.

Text objects now support character spacing (as a fraction of the character
width) and text scaling. Also, the alignment enum is now safe.

For some reasons std::thread can’t be joined in Visual Studio 2013. Needs
more investigation but right now it’s Ludum Dare and I don’t have time.

This sort of pImpl inheritance code code was weird, I got rid of it
and added a new pointer in the TileSet class instead.

Lua only supports the "double" type for now, so storing a 64-bit integer
would lose information unless it's encapsulated in a more complex type.
I prefer to disable these accessors for now.

Reworked Primitive logic for scene rendering
FileUpdateTester works now .....

Revamped thread communication
Fixed dynamic thread Add/Remove
Added unit-test for threads !!!!

- removed 177 CR characters
 - removed 12 trailing whitespaces
 - replaced 0 tabs with spaces
 - fixed 1 svn:eol-style properties

MeshViewer first pass

- removed 18805 CR characters
 - removed 774 trailing whitespaces
 - replaced 1922 tabs with spaces
 - fixed 31 svn:eol-style properties

SDL2: Mouse is back ! With correct focus support
SDL2: Added typing support with keyboard
ShaderBuilder: Refactored and simplified Shader block creation
Several warning removal
Fixed Image::Copy