Changed

Organized the source code using classes and multiple files instead of everything being packed into main.cpp
Korai can now open files directly from command line and from right-click menus
Now dialogs have Client Side Decorations
Korai now closes when reloading the MIME types database, as it previously would not so the screen would be forever white
Added a spinner to make more noticeable when Korai is loading something
Korai now moves to the center of the screen instead of appearing in the left

Bugs solved

Korai would behave very annoyingly when browsing mangadex if the user pressed the back or forward buttons (Korai would try to load last and next chapters instead of trying to go back or forward in the web view)