* Remove ccache.cmake so ccache can work on older cmake versions
* Revert "Remove ccache.cmake so ccache can work on older cmake versions"
This reverts commit 22301d41d31e72f7d1bbb68dfa601b0e3bf79b22.
* Update version
* CI-unixish.yml: handle precompiled headers with `ccache`
* actually support `ccache` in CMake < 3.17
* CI-unixish-docker.yml: split CMake build and test execution into separate steps
* findDependencies.cmake: only print message about macthcompiler being disabled when it is actually used
* CI-unixish-docker.yml: added missing `ccache` CMake options