Add mac style notifications to mailsync script on "darwin" operating systems

Provide a sane error message in case dialog is not installed

Increase compatibility with NixOS

(cherry picked from commit ea233da43a)

This reverts commit 708787a101.

Use `$HOME` instead of `/home/$(whoami)`

In macOS home is `/Users/$(whoami)`

special chars in password

Update offlineimap_profile

Removed "sslcacerfile = /etc/ssl/cets/ca-certificates.crt" on line 10 - it was pointing to non-existant directory "cets" instead of "certs" - this setting is overwritten later with correct path therefore no errors would register.

Use `$EDITOR` instead of hardcoding vim

MacOS compatibility

fix adding new account in macos

Fix mailsync ping command

Fix mutt-wizard

Fix muttrc for mac

Add files for offlineimap_profile and offlineimap_header

Update README with MacOS install instructions

added option to get rid of XOATH2 authentication failed warnings

under Qubes OS the use of qubes-gpg-client (instead of gpg) will not work with the -q option, but with the --quiet option.
As such using the full parameter names will not harm to all "normal" users, but make the script more stable for other users.
Additionaly it makes the scripts more readable for beginners to understand what the script is doing.