* Adds catch, cppunit, spdlog, tinyxml(1 and 2), google benchmark
Tinyxml comes in two flavors, 1 and 2. Each comes in several
versions... So they cannot be easily united into a single package.
* Use CMakePackage and friends, add copyright
Also eleminate debug/release variants, since it no longuer fits in the
CMakePackage format.
* Remove unnecessary url
* spdlog now has tagged releases
* Remove unnecessary url argument
* Fewer quotes in cmake args, because magic
* Incorrect base class for tinyxml
