Major changes in 3.24.3:
* Fix date calculation in week header (Orkun Tezer)
* Plug many memory leaks (Mohammed Sadiq)
* Draw current time strip over events in Week view
* Reliably keep track of time with a new internal clocking API
* Add a new --debug option, to show debug messages
* Use libical2 to build Flatpak
* Improve Month view rendering code (Abdullahi Usman)