Actually release interned string data when refcount drops to 0
Add scoped aliases

aliases are now stored in window, buffer, or globally.
Use an alias for the :alt command defined in cpp.kak
Fix clang autocompletion
Add kak binary location to PATH env var automatically

That way the kak binary can be guaranteed to be available even
if not in user PATH.
Add scope class and encapsulate Options, Keymaps, Aliases and Hooks in it
much simple clang completion script
Change :info -anchor option, take directly a buffer coordinate

Fix ctags funcinfo feature using that