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As a prerequisite to wrapping campvis::CameraProperty, bindings for two
new classes from TGT have been added: tgt::Vector3 and tgt::Camera.

References #1

Now that TGT and campvis-core can be built as shared libraries, the few
remaining issues with the first Lua pipeline could be tracked and fixed.
As a result, the pipeline can be executed without any issues, and its
functionality exactly corresponds to that of ResamplingDemo. To achieve
this, several additional classes, methods and constants had to be
wrapped.

References #1

All interface files used to live under `scripting/`. However, that
separated them from the code they were binding and clustered them
unnecessarily.

Make each interface file part of the CAMPVis component whose code it's
binding. This fixes the issues mentioned above and makes it possible to
build Lua modules conditionally, depending on what components of CAMPVis
are enabled.

References #1

TGT-related glue code has been moved to a new interface file: tgt.i. It
wraps and instantiates tgt::Vector2 and (starting with this commit)
tgt::Vector4.

Many methods of those classes and a lot of typedefs haven't been wrapped
yet. This will be fixed when necessary in future commits.

References #1