The scene now owns its renderer, so there is no need to keep a list
of existing renderers and to call Renderer::Get().

We used to have lol::map::empty() to empty maps, but in std::map
this method is called clear(). It sounds safe to harmonise between
our types and have lol::array::clear() too.

debug draw fixes are really un-numerous in ze lol, it seems

We already have the convenient degrees() and radians() functions to convert
between angle formats. This commit involves a lot of refactoring here and
there and I may have missed some places where conversions were needed. But
hopefully there aren’t may such places.

This lets us use the code for non-float variable types. I also got
rid of the mat4-to-quat code so that users are forced to use the
mat3-to-quat code and possibly discover places where their code is
suboptimal.

The containers no longer force the user to use the ptrdiff_t type for
size information. For convenience, size() now always returns an int,
and the size_s() method offers a way to handle arrays with more than
2 billion elements. Internally, we still use ptrdiff_t, though.

Since so much code had to be changed, I took the opportunity to get
rid of capitalised accessors for classes that are lowercase.

Scene rendering logic is now better

DefaultThreadManager build FIX

Big FAT pass on windows-warning. It is better now.

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[].

scene so that g_scene can be deprecated later.

- removed 6 CR characters
 - removed 24 trailing whitespaces
 - replaced 15 tabs with spaces
 - fixed 1 svn:eol-style properties

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

in the scene where we can push and pop cameras.