Most relevant commits:
- templates/builtin: add global functions to use in templates
- cmd/scriggo: use Scriggo builtins serving templates
- compiler: make 'for in' statement iterate over the keys of a map
- compiler/checker: fix error type checking 'for in' on channel
- cmd/scriggo: fix error while building an interpreter
- cmd/scriggo: change module path
- cmd/scriggo: add "runtime/metrics" package to stdlib