Seth R Johnson e131d9f974 FindSWIG: Add COMPONENTS support for SWIG target languages
Newer versions of SWIG drop support for some target languages, and some
forks of SWIG (such as for Fortran and MATLAB) aren't supported by the
mainline version of SWIG.

Swig versions as old as 1.3.6 (circa 2001) and possibly older use the
same format for listing available wrappers "%-15s - Generate %s
wrappers", so component detection should be quite reliable.
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CMake Tests Directory
*********************

This directory contains the CMake test suite.
See also the `CMake Source Code Guide`_.

.. _`CMake Source Code Guide`: ../Help/dev/source.rst

Many tests exist as immediate subdirectories, but some tests
are organized as follows.

* ``CMakeLib/``:
  Source code, used for tests, that links to the ``CMakeLib`` library
  defined over in ``Source/``.

* ``CMakeOnly/``:
  Deprecated.  Tests that run CMake to generate a project but not build it.
  Superseded by ``Tests/RunCMake/``.

* ``Find*/``:
  Tests for specific find modules that can only be run on machines with
  the corresponding packages installed.  They are enabled in
  ``CMakeLists.txt`` by undocumented options used on CI builds.

* ``Module/``:
  Tests for specific CMake modules.

* ``RunCMake/``:
  Tests that run CMake and/or other tools while precisely checking
  their return code and stdout/stderr content.  Useful for testing
  error cases and diagnostic output.