Removed redundant CMake options, renamed test-campvis to campvis-test and removed pipeline and converter registration, since building shared libraries is mandatory now.

* CMake build files now support unix builds
* SWIG interface files and Lua wrappers are now fully C++ compliant to comfort GCC
* Hacked shared/static builds of the campvis-modules module even more, but now it works on both MSVC and GCC

The FindLua CMake script would previously set LUA_FOUND if the directory
containing the source code of Lua existed without checking if it was
actually part of the build. This could lead to compilation errors if
CAMPVIS_BUILD_LIB_LUA was disabled.

Add an additional check to FindLua to only set LUA_FOUND if
CAMPVIS_BUILD_LIB_LUA is ON and the directory containing the source code
of Lua exists.

References #1

Out-of-tree builds were broken due to Lua and Swig header files not
being correcly included. The state of Visual Studio builds was even
worse: they failed because Lua modules, scripts and libraries were
misplaced.

The issues mentioned above have been fixed by making the build system
properly deal with out-of-tree builds and multi-config generators.

References #1

An option to enable CAMPVis scripting has been added to the top level
CMakeLists.txt. Moreover, a minimal sub-project for the scripting
feature has been created. There's also a new CMake macro, FindLua, that
locates Lua's include and library files.