.openvpn: Remain privileged not to interfere with the finalization process

After being unprivileged, commands like "route" do not work, which makes
it impossible to release the resources. On Windows, chrooting also leads
to improper initialization.
.openvpn: Use shorter options
.openvpn: Clean up the settings
.openvpn: Allow the server to change its IP address and/or port number
.openvpn: Add missing options that are not yet used
.openvpn: Use more preferred method for preventing MITM attacks
.openvpn: Improve the up and down scripts using sed and resolvconf
.zshrc: Make sudo accept shell aliases
.zshrc: Change the meanings of the aliases for redirecting output
.Xmodmap: Comment out the outdated Hangul key workarounds
.Xmodmap: Swap the Escape key and the Caps Lock key
.openvpn: Prevent the up and down scripts from writing to stdout
.openvpn: Do not use the status file