typedecl: Define aliases for items in static_string namespace and rename sss
typedecl: Define aliases for items in static_string namespace and rename sss

Define aliases for items in the static_string namespace:
- static_string::concat -> ssconcat
- static_string::from_provider -> ss_from_provider
- static_string::static_string -> static_string

Rename:
- sss -> split_static_string

erdavila/c-plus-plus-11,erdavila/my-cplusplus-playground