Add method of opening text files with sudo -e

[mason1920]

sudo -e allows the user to edit files of a different user as themselves by making a temporary copy. This can be used to edit privileged files in a familiar environment.

It is superior to the existing method of the r flag, which uses sudo -E and invokes another program, su, with the m option, which doesn't keep the user's path, preventing the user from using a locally installed editor/program.

Additionally, the user might not be authorized to use sudo -E when they otherwise would be able to use sudo -e. The reverse is true as well, so both should be options.