Disable the scripting feature by default

Scripting was so far enabled by default on the `swig` branch to make its
development easier. However, it should be an opt-in feature once it's
merged in. As that time is quickly approaching, the scripting feature has
been disabled by default.

References #1

CMakeLists.txt

@@ -16,7 +16,7 @@ OPTION(CAMPVIS_DEBUG                "Activate debug code?"
 OPTION(CAMPVIS_BUILD_APPLICATION    "Build CAMPVis Application"                                     ON)
 OPTION(CAMPVIS_BUILD_CORE           "Build CAMPVis Core"                                            ON)
 OPTION(CAMPVIS_BUILD_MODULES        "Build CAMPVis Modules"                                         ON)
-OPTION(CAMPVIS_ENABLE_SCRIPTING     "Add support for scripting CAMPVis using Lua"                   ON)
+OPTION(CAMPVIS_ENABLE_SCRIPTING     "Add support for scripting CAMPVis using Lua"                   OFF)
 OPTION(CAMPVIS_BUILD_LIB_TGT        "Build TGT Library"                                             ON)
 OPTION(CAMPVIS_BUILD_LIB_LUA        "Build Lua Library"                                             OFF)
 OPTION(CAMPVIS_BUILD_DOXYGEN        "Build Doxygen Documentation"                                   OFF)