This name was chosen to reflect the analogous name in VTK.

Specifically, I am trying to compile the code on OSX. OSX uses OpenGL
libraries in a different directory than most other installs (including
X11) and does not generally support GLX. These changes remove the files
that support GLX in systems that do not support it.

I also added several header files to the CMake lists that were not there
but should have been.

Added a GL-based render surface.

Add the mesa libs to the link line.

This largely follows things from EAVL. This is going to change going forward.
Most of the stuff is inside Window.h right now for convenience.

These changes support the implementation of DispatcherBase. This class
provides the basic functionality for calling an Invoke method in the
control environment, transferring data to the execution environment,
scheduling threads in the execution environment, pulling data for each
calling of the worklet method, and actually calling the worklet.

The FunctionInterface class is a convienient way to wrap up a variable
number of arguments and pass them around templated interfaces without
requiring variadic template arguments. It also correctly hands return
arguments.

This includes the configure scripts to setup if you want a 32bit or
64bit build.