caveats: Differentiate zsh completion files and function files

When installing a file to zsh/site-functions directory, it is assumed this is a zsh completion file,
and the zsh completion caveat is printed after installation.

But not all files in the zsh/site-functions directory are completion files.
Some are files for functions that can be loaded on demand with zsh's autoload command.

- Edit Keg.completion_installed to search specifically for files in the zsh/site-functions
  directory starting with an underscore only (By convention, zsh completion files start with an underscore)
- Add Keg.zsh_functions_installed to search for non-completion files in the zsh/site-functions
- Add Caveats.zsh_function_caveats to print a caveat if non-completion files have been installed
  to zsh/site-functions

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