Nagstamon 3.4

• added multiple item selection and actions execution
• added notification for OK state
• added darkmode for macOS
• added option to copy service to clipboard
• added support for custom CA cert for Sensu/Uchiwa
• added support for IcingaWeb2 expire time
• added server encoding detection
• updated components
• fixed crash when selecting downtime on down host
• fixed settings filenames troubles by url-encoding them
• fixed pyinstaller onefile issues on macOS
• fixed Kerberos issues on macOS
• fixed Cinnamon systray/popup issue
• Centreon fixes
• Checkmk fixes
• IcingaWeb2 fixes
• Monitos4x fixes
• op5Monitor fixes
• Sensu fixes