Improve install/uninstall scripts for non-root

[Barbiero]

I've changed the (un)install scripts so that they are a bit more robust

• You can now use options like -i and -s to explicitly set the install directory or the symlink path
• it can create symlinks without sudo if the current user has permission to do so on the target symlink path
• ensure that the target symlink path exists so we don't get cryptic errors if the user forgot to mkdir.
• you can now install phpctl from a local repo with -l, mostly useful when you already cloned this repo and don't want to fetch from github
• use tput for terminal colors if possible
• can now uninstall without sudo

Also:

• remove the phtpctl.dev reference from install.md since that URL is no longer accessible (See #49)
• add an editorconfig just so my IDE/shfmt won't try to change every single whitespace indent