Features

• More robust implementation of fatser builds with ccache

  option to control the use of ccache, default is OFF (49a17a9)

  Caching is enabled in GitHub CI builds and can be enabled in development environments by simply setting the cmake variable USE_CCACHE to 'ON'/'TRUE' or equivalent.

  A precondition for the environment is of course to have ccache installed which gets done automatically in GitHub workflows, but needs to be done in development environments. It is recommended to use brew/choco for MacOS/Windows, but to install from the pre-built binaries for Linux as the version that comes with most distros is quite old.

  It is to be noted that ccache with MSVC on Windows may have some issues and if that is the case, simply do not use it.