Add: catch2 v2.13.10

src/3rdparty/CMakeLists.txt

@@ -1,3 +1,4 @@
+add_subdirectory(catch2)
 add_subdirectory(fmt)
 add_subdirectory(md5)
 add_subdirectory(squirrel)

src/3rdparty/README.licensing

@@ -1,3 +1,3 @@
 The files in this directory are not licensed under the same terms as the
-rest of OpenTTD. Licensing details can be found in OpenTTD's readme.txt
+rest of OpenTTD. Licensing details can be found in OpenTTD's README.md
 and in this directory or subdirectories as well.

src/3rdparty/catch2/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_files(
+    catch.hpp
+)

src/3rdparty/catch2/LICENSE.txt

@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.