ENH: Refactor KWStyle testing

All ITK Modules C++ source and test files will now be checked with KWStyle,
except External, Remote, and ThirdParty. A separate test for Review code
is no longer needed, and is removed.

Support for GCC-format output of KWStyle is added.

The list of KWStyle error exceptions (ITKOverwrite.txt) is greatly
reduced in length.

A bug preventing the KWStyle Make target from running is fixed.

Finding the KWStyle program is factored out into an independent CMake
module.

Several unnecessary files are removed, including a C shell script
that wasn't portable and only checked individual directories.

Change-Id: I089dbfe3273d32bb980d2c902835e980d741c553
Merge topic 'KWStyle-Simplify'

026fbaa ENH: Refactor KWStyle testing