1.2.3 - Notarization and fixes

• The app is now notarized! Thanks to donations and sponsors, the fee for joining Apple Developer Program has been covered! This means the app is now notarized so the "Apple cannot check it for malicious software. This software needs to be updated. Contact the developer for more information." popup will no longer be a problem (see #11, #27, #29, #30, #33, and #34).
• Fix for #22
• Potential fix for #25, #26, and #32