John McFarlane

- Replace cnl::_impl::identical with test-local equivalanet - Remove cnl::_impl::assert_same entirely

using [COST](https://cmake.org/cmake/help/latest/prop_test/COST.html)

* Please check to see if this request is already in [the request list](https://github.com/johnmcfarlane/cnl/issues?q=is%3Aissue+label%3Arequest+). **What would you like to see in CNL?** Describe the feature you think is missing. (This...

Repro of #991

CI image blitz

1

- [x] Wait on release of Clang-12, GCC-11 and Ubuntu 21.04 - [x] Fix ccache for all compilers and Clang-Tidy - [x] Use the gist mentioned [here](https://github.com/conan-io/conan/issues/1692#issuecomment-743981132) - [ ]...

There should be a way to mark the config file as an explicit dependency.

Use \ instead.