Fix security vulnerability allowing command line exploit when using sendmail from the command line
(cherry picked from commit ac56f03bdfc30b379aeecd4ff317d08fdaa328c2)

Conflicts:
	lib/mail/core_extensions/shellwords.rb
	lib/mail/network/delivery_methods/exim.rb
	lib/mail/network/delivery_methods/sendmail.rb
	spec/mail/network/delivery_methods/sendmail_spec.rb
Making sure that destinations are also properly escaped in all version of ruby
(cherry picked from commit 39b590ddb08f90ddbe445837359a2c8843e533d0)
Preventing file system traversal in file_delivery method
(cherry picked from commit 29aca25218e4c82991400eb9b0c933626aefc98f)
Merge pull request #518 from liveline/backport_2.4.2-2.4.4_fixes

Backport 2.4.2 2.4.4 fixes