Build cache also from webserver (if possible) - set $modulekit_is_cached
modulekit_cache_invalid() decided whether cache is outdated
Set $modulekit['version'] from $version and (if available) git HEAD SHA-1
Set $modulekit_nocache to disable caching
Compile all JS-files into one, load this if possible
modulekit_include_js/_css(): Create $suffix from modulekit_version()
Compile all PHP-files into one, load this if possible