use gsed/gawk/grep on OpenBSD, also replace pidof with pgrep for
detecting existing process.

Set hostname variable

Ref:

b9a95a055a (commitcomment-52203708)

The macOS version of `pidof` doesn't implement the `-s` flag.

update domain list

add mac alternative domains
(@mac.com/@me.com)
these are legacy domains that
mac used to use which have been
merged into icloud

for more info see:

https://support.apple.com/en-us/HT201771
https://getmailspring.com/setup/access-mac-com-via-imap-smtp

also add ucsc.edu, which like the other uc's uses
google

added snopyta.org to domains.csv

add thunix.net to domains.csv

Add university of saarland to known domains

fix: update mbsync call for macos

in accordance with #694

added new domain

add ik.me domain

Signed-off-by: Nicolas Serafini <serafini.nicolas@gmail.com>

This reverts commit c95428f0f1.

add uni.strath.ac.uk

Update UPMC/SU email address configuration

These might need STARTTLS explicitly disabled in the msmtp config file though

A user reports notifications not working on their setup because there is
no display id  contained in the `ps`/`pgrep` output  concerning the Xorg
process.

This commit checks if there's a display server running at all, and if so
it sends notifications even if there's no display id.

Resolves https://github.com/LukeSmithxyz/mutt-wizard/issues/661