work on OpenGL ES contexts.

but we can now create shared objects for each project; only the testsuite
is not building properly because of issues with STLport, and EglApp is
deactivated because AndroidApp should have precedence.

parallel builds accordingly.

X11 to create the EGL-capable display.

used in the fractal computation).

to zero.

fully initialised.

build until further fixes are made.

and MinGW-built, because of some weird %rip corruption at runtime when
linking the MSVC DLL with mingw-w64.

libraries only work with the Visual Studio runtime.

to char *.

on Windows if using Visual Studio; if using MinGW, try to stick to the
original main() entry point.

if appropriate.

do not open a console at startup.

+ Constraint hollow class.

+ weird racist test : the primitives only collide with their same type.

Phys::Simulation is now an entity.
Phys::Simulation now implements timesteps correctly.

the mathematician-friendly [w x y z].

and add a new "UseBullet" configuration flag.