nightly
* enable precompilation on nightly * update CompileBot, add precompile statements for nightly
* versioned precompile script * add explicit minor version in CI * revert to supporting 1.5 - 1.7 * update precompile_includer * drop support for 1.5, bump to 1.6 * Update ci.yml Co-authored-by: Simon Christ <SimonChrist@gmx.de>