refactored zsh configs, commented gpg-agent.conf

refactored zsh configs, commented gpg-agent.conf

zsh:
- added vim modeline and site-local import to every file
- added .zlogin following the above
- moved arrows prompt to subdirectory
- updated arrows prompt to make right mode look better
- moved everything out of .zshenv, it never should have went there
- moved interactive content to .zshrc and set-once content to .zprofile
- updated application loading (perl, gpg)