- removed make_context and idea with functions and closures
- add to_object (for simple types like 'qwe', 1, true), use_key and cget (to read context with key with saving access to whole context)
- regexps for splitting strings with $keys in GLOBALS
- renamed render_context to render_context_to
- added using map to partial without 'key', but with same partial
  add_map('index', index) -> add_map(index)
  print_map('index') -> print_map(index)