Unfortunately, easymesh code still relies heavily on its specifics, so I’m
letting it live as lol::easy_array for the near future. But it’s going away.

Now we can call functions that need to access GPU resources explicitly
on the draw thread.

Controller::WasKeyReleasedThisFrame() is now keyboard->key_released() so
there is usually no need for a controller. They will completely disappear
when joystick axis binding has been ported to InputDevice.

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

- Most recent version is in with index buffer support

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.

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.

DefaultThreadManager build FIX

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

scene so that g_scene can be deprecated later.

core: calling InitGame() at the first tick of an entity. InitDraw is still uncalled yet
fixed mrpigeon and orbital accordingly