• Use system temp directory instead of ~/.zef/tmp and allow $*TMPDIR to be usable as a value in the zef configuration.
• Fix appveyor CI failures by setting the TMPDIR env variable to a shorter path, so the rakudo generated precompiled files would not exceed the windows maximum
• Switched test files to .rakutest extension
• Add slightly stricter version requirements for dependencies
• Renamed repository branch name references to 'main'