Itsycal 0.15.3

• You can set a custom beep-beep-on-the-hour sound. Place a file called beep.mp3 in Itsycal's Application Support folder: ~/Library/Application Support/com.mowglii.ItsycalApp. If you have selected `Beep beep on the hour` in Settings, this custom file will play instead of the default sound.
• Fix: Go to Date can be invoked with the "return" key - you don't have to click the button.
• Fix: Addressed a crash in the rare case that an event's attendee name is set to nil.
• Fix: Addressed corrupted window drawing on macOS Sonoma when the user has multiple monitors and a large number of events in the agenda.
• Fix: Long calendar names wrap in the General Settings calendar list.