Squashed 'externals/catch/' content from commit ab6c7375b

git-subtree-dir: externals/catch
git-subtree-split: ab6c7375be9a8e71ee84c6f8537113f9f47daf99

.gitattributes

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+# This sets the default behaviour, overriding core.autocrlf
+* text=auto
+
+# All source files should have unix line-endings in the repository,
+# but convert to native line-endings on checkout
+*.cpp text
+*.h text
+*.hpp text
+
+# Windows specific files should retain windows line-endings
+*.sln text eol=crlf
+
+# Keep executable scripts with LFs so they can be run after being
+# checked out on Windows
+*.py text eol=lf
+
+
+# Keep the single include header with LFs to make sure it is uploaded,
+# hashed etc with LF
+single_include/**/*.hpp eol=lf
+# Also keep the LICENCE file with LFs for the same reason
+LICENCE.txt eol=lf