GitLab

* undo changes to .gitignore (regarding SWIG temporary files)
* moved implementation of PositionData and TransformData from header to source file

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

Lua functions invoked by LuaPipeline had no access to the pipeline
instance and, as a result, couldn't configure or modify it in any way.

In order to make it possible to actually define pipelines in Lua, each
script can now access the C++ pipeline object it's supposed to augment
via a global variable named instance. This variable is injected into the
script by LuaPipeline and can be used to call standard pipeline methods
(e.g. addProcessor).

The functionality described has been tested by implementing a pipeline
constructor that creates and registers several processors.

References #1

To test the feasibility of using SWIG to generate Lua bindings for
CAMPVis several classes have been wrapped with SWIG interface files.

If version 2.0.11 of SWIG is used to generate bindings, it must be
patched to fix wrapper compilation errors:
https://github.com/badshah400/swig/commit/ea4a4e435f721380555fea039bd5dc758eda43ae

References #1

This initial .gitignore masks build by-products and project files of some
IDEs.